Watch Band Size Chart (mm)

When a traditional watch takes a "20mm band", that number is the lug width: the distance between the inside faces of the two lugs, the horns that stick out from the case top and bottom and hold the strap via a spring bar. It is the single number that decides which replacement strap or band fits your watch, and it is measured in millimeters. This page is the chart for traditional watches. If you wear an Apple Watch, band sizing works completely differently (adjustable box sizes and numbered stretch-loop sizes instead of lug widths); that is covered in our Apple Watch band size guide. Samsung's Galaxy Watches are the opposite: they do use ordinary millimeter lugs, nearly all of them 20mm, and the model-by-model list is in our Galaxy Watch band size chart.

Standard band widths: the mm chart

Most watches use even-numbered lug widths in 2mm steps (16, 18, 20, 22, 24mm). Odd widths (19mm, 21mm) show up mostly in luxury and vintage watches and are the classic trap: a 21mm watch is common enough that strap makers stock the size, but selection is much thinner than 20mm or 22mm. The chart below maps each width to the case diameters it typically appears on:

Use this as orientation only. Width tracks case style, not just diameter: a slim 40mm dress watch can take 20mm while a chunky 42mm diver takes 22mm. When the chart and your watch disagree, your watch wins.

Lug width meaning: the 30-second version

• What lugs are. The four horns extending from the case at 12 and 6 o'clock. The strap end slides between each pair and is held by a spring bar, a spring-loaded pin that sits in small holes drilled in the lugs.
• What to measure. The clear gap between the inner faces of one pair of lugs, where the spring bar passes. Not the case diameter, not the strap's outer edge.
• How to measure it. Lay a ruler across the lug gap in millimeters and read the inside-to-inside distance, or use calipers for odd widths where 19 vs 20mm matters. Looking straight down at the watch, with the ruler resting on the spring bar, is the least error-prone angle.
• Taper is a separate number. Many straps narrow toward the buckle: a 20mm strap that tapers to 16mm at the buckle is sold as "20/16". The lug end must match your lug width exactly; the buckle end is a style choice, and the buckle itself must match the tapered width, not the lug width.
• Thickness. Roughly 2-3mm reads dressy, 3.5-4mm everyday, 5mm+ bold and sporty. Only a concern on watches with very tight clearance between the lugs, where a padded strap may not seat cleanly.

Lug width by watch model

Every row below is confirmed by at least two independent sources (strap makers' model-specific fitment pages and watch spec databases). The generation matters more than the model name: Rolex's 2020 update moved the Submariner from 40mm/20mm to 41mm/21mm, and mixing those two up is the most common wrong-width purchase in watchmaking.

Two footnotes worth knowing. The Tudor Pelagos FXD uses fixed bars instead of spring bars, so ordinary two-piece straps do not fit it without an open-ended or pass-through design. And within the MoonSwatch range the strap size is the same 20mm for every mission; the collections are a color menu, not a compatibility list. This table expands over time; the companion lug width chart by brand now carries the expanded per-model table with Seiko, Citizen, Fossil, Casio, Tissot, Hamilton, and Orient rows, and the per-model brand pages cover Seiko, Casio, Citizen, Timex, Invicta, and Bulova in depth, plus Michael Kors with its full 108-model caseback-code table (Timex adds a Timex row above because nearly its whole men's line is 20mm), and Fossil analog by collection and caseback code. Nixon is the odd-width brand: the Nixon chart sorts the 23mm Sentry from the 20mm Sentry Solar, the 25mm screw-bar 51-30, the 24mm Corporal and the 21mm Patrol. Luminox is the same disease in uniform: the Luminox chart splits the 21mm Original Navy SEAL 3000 from the 23mm Colormark 3050 and the 24mm 3500, and pins the Pacific Diver at 24mm. Doxa is the brand where the depth-rating name hides the width: the Doxa band size chart splits the 18mm SUB 200T, the 19mm SUB 200 with its 20mm-wide bracelet, the 20mm SUB 300/300T/600T pool and the 21mm 750T and 1500T, and refuses the one SUB that takes no standard strap at all. Alpina spreads one collection across the whole ladder: the Alpina band size chart sorts the 22mm 44mm Seastrong Diver 300 from the 21mm Diver 300 Heritage, the 16mm integrated-mount Diver Extreme and the 15.25 to 22mm Alpiner and Startimer families, all anchored on the brand's own Lug Width fields. Marathon brings the military-spec ladder to the civilian market: the Marathon band size chart sorts the 16mm General Purpose watches from the 18mm Medium Divers, the 20mm Large class (GSAR, TSAR, Navigators) and the 22mm Jumbos, plus the MIL-S-46383B nylon lengths. NOMOS is the brand that made odd widths the design language: the NOMOS chart sorts the 19mm Tangente 38 from the 18mm Tangente 35, the 18mm Club 36 from the 20mm Club 38, the 16mm Metro 33, and the 20mm Tetra neomatik that is really a 33mm square. Movado never prints a width on its own pages, so the Movado chart is built from the brand's own replacement band SKUs: 20mm for the current Museum Classic, 21mm for the earlier generation, 22mm for Museum Sport and the men's BOLD, and a four-way BOLD family split. Victorinox runs on reference numbers the same way: the Victorinox chart sorts the 21mm I.N.O.X. family from its 16mm Small, the three-width Alliance ladder, and the Maverick Large generation split where 241xxx is 22mm and 242xxx is 21mm. Wenger shares the Swiss Army bench and answers the same question with a part number instead: the Wenger band size chart decodes the 07.xxxx.xxx strap numbers where digits 5 and 6 are the width, and flags the odd 17 and 21mm lines the strap trade understocks. Christopher Ward is the brand where the reference number carries the answer: the Christopher Ward chart decodes the family-plus-size reference system and separates the 20mm steel Tridents from the 22mm titanium ones, plus the Twelve family's non-standard 25mm. Baume & Mercier is the brand where the collection, not the case size, holds the answer: the Baume & Mercier chart separates the 21mm Clifton Club from the 20mm dress Cliftons and the 21mm Capeland 44mm chronographs from their 20mm 42mm siblings, pins the men's Hampton at 22mm via the manufacturer's own strap pages, and gives the Riviera's proprietary Fast Strap system its own disclosure rows. Once the width is settled, the watch strap taper chart decodes the second number in listings like 20/16. Grand Seiko is the brand where the reference number, not the case size, holds the answer: the Grand Seiko chart spans six widths from the 18mm mid-size 44GS manuals through the 19mm Elegance dress watches and the 21mm Shunbun to the 22mm divers and the 23mm Evolution 9 sport pieces, with the uniform-table incumbent errors flagged reference by reference. Panerai is the brand where the case-size rule breaks by reference: the Panerai chart runs from the 20mm Luminor Due to the 27mm Radiomir California, flags the 24mm Radiomir Quaranta against the 22mm the inherited tables print, and covers the screw-bar hardware that decides which tools the swap needs before any width question. Smartwatch owners are sized by official S/L wrist ranges instead of lug width: the Fitbit band size chart covers every Fitbit family that way, and Amazfit owners get a per-model width and connector table in the Amazfit band size chart, whose T-Rex rows are worth reading before any band purchase. Xiaomi is the brand where the mount matters more than any width: the Xiaomi band size chart separates the pop-out Mi Band capsules, the Band 8/9/10 quick-release clip and the standard 22mm Watch S line. Suunto owners have the opposite problem: the width splits hide in near-identical names, so the Suunto band size chart sorts the 9-versus-9-Peak and 5-versus-5-Peak traps. Huawei is the one brand that publishes its own wrist-circumference ranges, so the Huawei band size chart carries the official fit range next to every width, including the QuickLink-only Fit line and the 26.5mm Watch D2 medical strap. Withings plays the same game in reverse: the hybrid health watches never left the width system, so the Withings band size chart comes down to two widths, 18mm on every case to 39mm and 20mm on every 42 to 43mm case, all on standard quick release spring bars. Polar is the brand where the mount decides more than the width: the Polar band size chart splits the standard 22mm Grit X and Vantage line from the 20mm Ignite, Pacer and Unite pool, and flags the Vantage V2 and Pacer Pro, which take standard bands only through Polar's own adapter. Sinn is the German counterexample: the Sinn chart prints every width from the factory pages, splits the 20mm U50 and T50 from the 22mm U1 and U2 inside the same diver family, and decodes the S/M/L strap-length system next to the widths. Bell & Ross is the brand where the case shape sets the width: the Bell & Ross band size chart splits the square BR-03 family from the cushion BR-05 line, prints lug width and buckle width separately because they rarely match, and flags the BR-X3 where a 22mm strap meets a 24mm lug. Maurice Lacroix is the fit-list brand: the Maurice Lacroix band size chart runs the Aikon half-millimetre ladder (23, 23.5, 24, 25mm), flags the Aikon Straight strap mount No parts that take original straps only while Pontos and Fiaba accept generic ones, and charts the understocked 21mm Pontos width. Frederique Constant is the brand that prints both numbers and means both: the Frederique Constant band size chart splits the 22mm rectangular Carree from the 20mm round Classics beside it, pins the 42mm Runabout at the odd 21mm with an 18mm buckle while its 36mm ladies sibling takes 18mm, and decodes the Highlife's integrated system where the strap is 25.5mm wide on 22mm quick-release bars. Norqain is the brand that publishes the width on every page in the same words: the Norqain band size chart runs the 18/20/22 ladder by case size, splits the Wild ONE Skeleton into 20mm at 39 and 22mm at 42, and pins the Freedom 60 Chrono 43mm at 20mm despite being the largest three-hand case. Glycine is the brand whose width map the strap guides keep getting wrong: the Glycine band size chart re-pulls every current reference from the brand's own spec tabs, splits the Combat Sub across 18, 20, 22 and 24mm by case, pins the two first-generation bracelet references that take 20mm inside the 42mm generation, and flags the one guide that claims 18mm for all of them. Dan Henry is the brand that names every model after a year, which makes this table read like a timeline: the Dan Henry band size chart runs from the 14mm 1900 ladies watch through the two-width 1963, 1964 and 1970 splits to the 24mm 1970 diver, gives the lugless 1972 Maverick its own paragraph, and settles the 1973 question (there is no such model). San Martin is the brand whose two official stores print the width on every product page, which makes it fully chartable: the San Martin band size chart runs 80 SN and JIANGHUN families from the 18mm dress class through the 20mm mainstream to the 21 and 22mm big cases, scales the SN0144 across 19/20/21mm in one table, and separates the nine integrated-bracelet references that take no standard strap at all. MVMT is the brand whose own migration split the data: the MVMT band size chart re-pulls every collection from the retired spec blocks that still print Strap Width and the current pages that no longer do, pins the Classic II at 22mm against the original Classic's 24mm, and lists the bracelet families whose widths the current store omits entirely. Phoibos is the brand that prints the taper nobody else does: the Phoibos band size chart charts all 81 references from the brand's own Band lines, pins the standard 20mm into 18mm taper beside the Delphinus 20-16 exception, and splits the five 22mm strap families from the 20mm bracelet mainstream. Zelos is the brand with one rule and four exceptions: the Zelos band size chart shows 40mm cases on 20mm and 41mm-up cases on 22mm across the whole catalog, then flags the 41mm Blacktip that stays at 20, the 40mm Artemis on a custom 24, the lugless Chroma 2 and Cosmos, and the three-generation Helmsman that carried 22, 20 and 22mm. Lorier is the opposite lesson: the Lorier band size chart is one width for the whole catalog, 20mm on every current model, with the 39mm and 36mm classes splitting only on lug-to-lug and two retired 18mm lines, the Zephyr and the Safari. Serica is nearly as simple and hides the trap better: the Serica band size chart is 20mm on every reference the brand has sold except one, the shaped Parade 1174 at 18mm, with one retailer still listing the 5303-3 at the wrong 18mm. Ollech & Wajs is the same one-width lesson at 39.5mm: the Ollech & Wajs band size chart prints 20mm for every current model from the brand's own spec blocks, with the integrated 8001 and the limited 18mm 56 M the only exceptions. Halios answers the same question even more firmly: the Halios band size chart holds every generation the brand has printed at 20mm, Seaforths from 2016 to the titanium Series IV, and reserves the lone 24mm for the retired 48mm Puck. Nivada Grenchen is the brand whose own typos split the data: the Nivada Grenchen band size chart reads the width rows the brand prints under four different labels (Band Width, Strap Width, and the typo variants Strap With and Band With), charts the 35mm Antarctics at their printed 18 and 19mm split against the brand's own 18mm 35mm accessories, and maps the F77 strap classes from 22.3 to 23.5mm that no standard strap serves. Baltany is the brand where the 36mm class splits by model: the Baltany band size chart prints all 77 references from the manufacturer's own spec lists, sorts the 22 36mm models on 18mm from the four Datejust-style dress exceptions on 20mm, holds every 38 to 42mm case at 20mm, and splits the 44mm pair between 22 and 24mm. Farer is the three-width brand: the Farer band size chart carries all 38 current models from the Dimensions block Farer prints itself, keeps the 20mm mainstream next to the 18mm 35mm cushions and the 24mm Integra integrated lugs, and logs both printed lengths, lug-to-lug and pin-to-pin, for every case. BOLDR is the two-width brand with the tag discipline to prove it: the BOLDR band size chart charts all 133 catalogued watches from the brand's own spec lines and store tags, holds every 38 to 42mm case at 20mm, and splits the Freediver name between the 20mm 40mm models and the 22mm 44mm GMTs. STOWA is the brand whose own shop facets make the chart trivially verifiable: the STOWA band size chart mirrors the strap-width filter counts (18mm 26, 20mm 26, 22mm 23) from stowa.de's own catalog, adds lug-to-lug for every model, and splits the current 40mm/20mm generation from the retired 43mm/24mm one. For a watch not listed in either, measure the lug gap as described above, and remember the MoonSwatch's bigger sibling rule: the Speedmaster Professional it copies also takes 20mm, so one strap genuinely serves both. WHOOP sits entirely outside the width system: its bands have no lugs at all, and the WHOOP band size chart covers the one-size wrist bands and bicep S/M versus L/XL sizing that replace it. So does the Google Pixel Watch, with a twist: it has a connector but no lug width, and every band is picked by official wrist ranges and case size (41mm for models 1-5, 45mm from the Watch 3 on), all mapped in the Pixel Watch band size chart. Samsung's Galaxy Fit3 tracker is the same story in miniature: its one-click band shares nothing with the 20mm Galaxy Watch system, and the Galaxy Fit3 band size chart carries the official Sport Band dimensions instead of a width. Spinnaker is the collab catalog nobody had charted: the Spinnaker band size chart reads the Band line on all 245 watches in the brand's own store, holds every Croft, Bradner and Fleuss 40 at 20mm and every Hull, Dumas and 43mm Fleuss at 22mm, and splits the Fleuss name trap and the Dumas GMT 43-versus-44mm case print. Yema is the odd-width brand: the Yema band size chart reads the Lugs line on all 110 watches in the brand's own store and finds 35 of them on 19mm lugs while strap retailers sell the same watches as 20mm, plus 17 Wristmaster and Urban Traveller references on integrated 24mm straps no standard band fits. Vertex splits the other way: the Vertex band size chart reads all 8 watches in the brand's own store and finds 20mm on every M100 and AquaLion but 18mm screw-in bars on the M36, while the MP45 prints no lug width at all and the pages contradict themselves on lug-to-lug (48.5 versus 49mm). Trilobe is the other kind of trap: the Trilobe band size chart reads the brand's own manuals and finds one width, 20mm, on every strap-wearing model in both case sizes, while the Trente-Deux prints no width at all because its bracelet is integrated into the case. Kurono Tokyo is the archive-catalog case: the Kurono band size chart reads the 71 archive pages the brand still serves, holds 18mm to the three 34mm drops and 20mm to a 16mm buckle on every 37 and 38mm model, and flags the 2026 Diver's, which is 19mm as a watch and 24mm inside its diving case. Monta is the one-width counterpoint: the Monta band size chart reads all 20 current product pages, finds Lug Width 20 mm on every single reference, and separates the catalog by lug-to-lug instead, 47mm on the 38.5mm cases up to 48mm on the Oceanking. Fears goes further: its 37 specification pages print a 20mm lug width on everything except the 22mm Garrick, and the Fears band size chart sorts the cushion-case range by lug-to-lug, 42mm on the 38mm Brunswick up to 47mm on the 40.5mm Jump Hour. Vaer is the same idea at DTC scale: 85 of its 90 live watches print a 20mm lug width, with only the 34mm C1 Ceremony and 36mm DS2 Meridian at 18mm, and the Vaer band size chart sorts all 90 into the brand case-size classes from 36mm Field up to 42mm Dive with lug-to-lug per model. Dievas is the one-width micro-brand taken to its limit: all 20 watches in the Singapore maker's live catalog print LUGS 20mm, so the Dievas band size chart sorts them into three case classes (39.5mm titanium, 41mm Maya at 49mm lug-to-lug, the sold-out 41mm Vortex 500 generation) and prints the strap tapers the brand itself sells at 20/18mm. Oak and Oscar is the brand that prints the whole fit column: every current model carries 20mm lug width in its own spec list, the bracelet taper is printed as 20mm to 16mm, and the bracelet wrist ranges are published too (6.2 to 9.1 inches on most, 6.3 on the GMT), so the Oak and Oscar band size chart charts all 23 watches including the retired 22mm Burnham exception the brand's own springbar guide calls out. Islander is the opposite problem: 340 references across three widths (20mm on 240, 22mm on 89, 18mm on the Astoria dress watches), so the ISL number on the caseback decides the strap, and the Islander band size chart tables all 340 from the brand owner's own store pages, flags the seven sold-out collabs that print no specs, and charts the bracelet tapers (20-16, 22-18, 20-18) the product pages print in prose. Melbourne Watch Company is the trap taken further: five current families share a 42mm case, and they split across both widths (Sorrento, Lonsdale and Carlton at 22mm, the GMT and Day/Date Anniversary editions at 20mm Quick Release, plus a Burnley on an integrated bracelet that takes no standard strap at all), so the Melbourne Watch Company band size chart tables all 47 live references from the brand's own pages, corroborates every family against the lug widths printed inside the brand-hosted owner handbooks, and carries the retired models (Avalon, Hawthorn, Collins, Chelsea, Fitzroy Chrono and GMT, Portsea Heritage, the original Flinders) from those same handbooks. Obris Morgan is the split at its cleanest: six of the seven current collections print 20.00mm Lug Width (Port, Aegis-II, Explorer-II, Nautilus and both SeaStars, across 39 to 42mm cases) and only the 43mm Infinity prints 22.00mm, so the Obris Morgan chart tables all seven spec blocks verbatim, decodes the bezel-versus-case print on the Port and SeaStars, and carries the retired Explorer-I, Aegis Gen-I, Branco, Pradata and Nevon from the reviews the brand still hosts. Circula is the brand that prints the wrist-fit ceiling itself: every watch in the 121-page en-US catalog takes a 20mm band, and the Circula chart tables the diameter x length-over-lugs x height x Max. Arm circumference matrix across all eight model classes, including the per-variant ProLab split and the 20,5-to-22 cm strap-option fit ladder. Edox is the brand that renamed the measurement: every one of its 317 current product pages prints the strap width as Horn-gap, and the Edox chart decodes the term and tables all ten widths from the 16mm ladies Delfin to the 25mm CO-1 and Chronorally 48mm chronographs, including the 18.5mm Grand Ocean Power Reserve trap and the quartz-versus-automatic Grand Ocean Chronograph split. Gavox never standardized the label at all: across its 104-page catalog the width appears as Lug width, Measure between lugs, Measure between horns (lugs) and Lug Width in prose, and 55 of 76 watches print no width anywhere; the Gavox chart decodes all four wordings, tables the 21 printed widths from 18 to 22mm, and isolates the three 19mm watches that all sit on 36mm unisex cases. RZE is the one-width catalog taken further: every current watch, strap and bracelet the titanium brand sells prints 20mm at the lugs, so the RZE chart tables the seven current families by the dimension that actually changes, lug-to-lug from 42.3 to 49.5mm, carries the end-link compatibility statement no incumbent has, and flags the one pre-order model that prints nothing. CWC is the fixed-bar brand where the half millimetre matters: four G10-family watches print 18.5mm, the whole GS Sapphire fleet prints 19mm, every diver prints 20mm with 47mm lug-to-lug, and the standard G10 itself prints no width at all, so the CWC chart quotes every rail from cwcwatch.com itself, decodes the 18.5-versus-19 swap the strap trade keeps making, and tables the twelve watches whose pages print no width, flagged not printed rather than guessed. Vario is the dual-width brand: most of its families print two straps in one rail because they ship in two case sizes (18mm(37mm) or 20mm(40mm) on the 1918 Trench, 18mm(35mm) or 20mm(40mm) on the A-11S, 18mm(37mm) or 20mm(41mm) on the D12), the Empire family prints the width as Strap Width instead, and the VERSA reversible splits 22mm Single Time from 20mm Dual Time, so the Vario chart tables all 17 signatures across the 59 watch listings verbatim, parentheses included. Nezumi is the one-width brand at the far extreme: every one of the 16 refs in the nezumistudios.com shop index prints Lug width: 20mm, so the Nezumi chart tables the 7 family spec blocks verbatim and decodes what actually differs instead, lug-to-lug 47 versus 45.5mm, thickness strings from 10mm ( + 1.7mm sapphire glass ) to 13.3mm, the Tonnerre comma decimal, and the Colin 2.2 versus Colin 2.1 bracelet split on the same 20mm. Dryden is the brand that splits in two on the strap question: every three-hand family (Heartlander, Heartlander Solar, Pathfinder) prints 20mm lug width tapers to 16mm at the clasp, while the Chrono Diver Gen 2 prints 22mm tapering down to 18mm and the Series 1 prints Strap: 22mm tapering to 20mm at the buckle, so the Dryden chart tables the two-width split, the 46 versus 47 versus 49mm lug-to-lug ladder, and the 18mm review taper the first-party 16mm overrides. Brew is the nonstandard-width brand taken further: sixteen of its 26 watches print LUG WIDTH: 19.85MM, an odd size no standard guide carries, and the Brew chart tables all 26 watches verbatim, splits the 18mm Metric Lite and 22mm Retrograph from the 19.85mm Metric families on case diameter and thickness, and decodes the mismatch where the brand's own strap shop sells 19.50mm suede and 20mm rubber for the same watches. Sugess is the dual-label counterpoint: one storefront sells both Sugess and its sister label Seestern, 116 of its 152 watch SKUs print a lug width in the feed itself, and the Sugess band size chart tables all of them verbatim, from the 18mm Seagull 1963 reissue class through the 19mm Seestern S446 GMT to the 21mm chronographs and tourbillons no strap shop stocks. Lum-Tec answers the question the other way, inside body copy rather than spec tables: 20 of its 24 watch SKUs print a width in the feed itself, and the Lum-Tec band size chart quotes every rail verbatim, including the brand's own point that the Combat B 51.5mm lug-to-lug wears like 46-47mm because the lugs curve down steeply, and the fact that the four Eclipse references print a 26 to 18mm integrated bracelet taper instead of any lug width at all. Ferro splits its 42 references into two printed widths: 25 of them, every Race Master, Time Master 70 and Paramount, print 20 MM LUGS in the rendered spec section their product pages carry, while the AGL 2 line states Lugs: 22 mm Lug to lug: 48 mm and the Distinct and Pista families land on 22mm the same way, and the Ferro band size chart tables all 42 verbatim, including the one reference that prints no width and the reason the merchant feed hides the 20mm fleet. MING is the catalog that lives in prose: 57 of its 74 references print 20mm (the 37.02 Ghost states 100m (260m) water resistance 20mm lug width and the 17-series ships 20x18mm curved-fitting straps) and 10 print 22mm (the 20-series chronographs and the whole 29-series), so the MING band size chart tables all 74 verbatim, names the 7 references whose pages print no width, and reconciles the third-party 19mm 17-series claim against the brand's own pages. Kingsbury is the 21mm trap in miniature: 7 of its 37 watch SKUs print Strap Width at Lugs (mm): 21.00 (every Varsity GT, every Varsity Sport and the Discovery Field) while the rest of the catalog splits 20mm and 22mm, and the brand's own strap shop sells no 21mm product at all, so the Kingsbury band size chart tables all 37 verbatim, quotes the 21mm-to-18mm rally-strap taper, and flags the label drift from Strap Width at Lug singular to the misspelled Case Heigh line. Ventus is the two-width split at its cleanest: 25 of its 33 watch SKUs print 20mm (every Mori, Mori 2, Northstar and the Field Watch One, which states 40mm Stainless Steel case, 46mm lug to lug length and 20mm lug width) and 8 print 22mm (the Black Kite carbon fibers and every Caspian at 42mm Brass case, 50mm lug to lug length and 22mm lug width), so the Ventus band size chart tables all 33 verbatim with a lug-to-lug column (45 to 50mm), flags the Mori 2 pages whose URLs disagree with their titles, notes the discontinued Caspian C-02 and Kona, and corrects the sister-brand record to Zelos, not NTH. Baltic is the flattest width profile charted so far: all 63 watch pages in the baltic-watches.com sitemap print the identical Lug width: 20mm rail, so the Baltic band size chart tables the whole catalog verbatim with the four-way lug-to-lug split (44, 45, 46 and 47mm by family), the factory 20/16 strap taper, the MK2 dual line Lug to lug: 45mm or 47mm printed as the brand prints it, and the three Aquascaphe GMT URLs that all render one archived page. DuFrane is the first three-width brand in the database: its leather strap page prints Choose 20mm (Waterloo, Travis, Mabry) or 22mm (Barton Springs, Bergstrom), the watch pages agree line for line, and the Westlake is the lone 18mm at 36mm case width 44mm lug to lug 6.99mm thick 18mm lug size, so the DuFrane band size chart tables all 9 watches verbatim with lug-to-lug (44 to 50mm), cross-checks them against four strap-page fit lines, notes the Bergstrom title that says 42mm while its own spec block says 41.5 mm case width, and flags the original Mabry bracelet that will not fit the Mabry MkII despite the shared 20mm. LIV is the two-width brand with an odd side: 41 of its 85 watches sit on 23mm lugs (every GX1 at 45mm Case Width, 13.4mm Case Height, 23mm Lug Width, 52mm Lug-to-Lug, every GX-AC, every GX-Diver's 44mm and every P-51 Big Pilot at Lug Width: 23.0 mm Height with Lugs: 52.4 mm), the other 44 take 22mm, and the traps are the GX1-A, the automatic sibling of the 23mm GX1 that prints Lug Width : 22.0 mm, and the GX-Diver's split that runs 22.0mm lugs on the 41mm case but 23.0 mm on the 44mm, so the LIV band size chart tables all 85 watches verbatim with the width exactly as each page prints it, pinned on the brand's own straps-menu rule. Henry Archer is the brand that hides the number from the machines and gives it to the humans: not one of the 281 rows in its merchant feed prints a lug width, yet every rendered product page carries a server-rendered specifications block that does, so the Henry Archer band size chart is built from one rendered page per model line and finds 20mm on 36 of 37 lines, a 14mm Sekvens Petite, and a factory bracelet taper the brand prints twice as Tapers from 20mm to 16mm. Boccia is the reference-number brand with the sparsest first-party record: only 23 of its 261 watch references print a strap width in the product copy at all, so the Boccia band size chart tables exactly those 23 by reference number, 14mm on the 3314 ladies pair through 20mm on the mens 3615/3620/3662/3664/3749 classes to the one 25mm tank, the 3147-04, and flags every untabled reference as not printed rather than guessed. Isotope is the brand whose widths sit one number away from the trap lines: its pages print 40 × 40mm (including lugs) and 42mm lug-to-lug figures everywhere, and the width itself lives in the Strap and Quick-release copy, so the Isotope chart builds the rail only from those lines and splits the catalog four ways: 18mm on every Flyway, 20mm on Mercury, the bronze Old Radium, the OVNI jumping discs and the Moonshot chronographs (the last two tapering to 18mm), 22mm across the whole Hydrium pool including X and Pro, and the 24mm GMT 0, whose basis is the brand's own strap-fitting sentence. Duckworth Prestex is the brand that documents half its catalog on the wrong side of the store: the Verimatic, Parker and Bolton pages print Lug Width: 20mm in their spec blocks while the Chronograph 42, Belmont and Rivington pages print no width at all, so the Duckworth Prestex chart builds the 22mm half from the brand's own strap-fitting sentences (20mm for Verimatic, Bolton, Parker, Coronation and Centenary 22mm for Chronograph 42, Belmont and Rivington) and says on-page which half has the watch-side line and which does not. Pompeak is the odd-width flagship brand: the Pompeak chart reads the Strap line off all 23 watches in the Bristol maker's complete 37-product feed and finds the Gentlemen's Classic on 21mm while the same-40mm-case Mallory and Sub-Aquatic sit on 20mm and the 45mm chronographs on 22mm, with the brand's own 21mm Straps page confirming the odd fit. Beaucroft is the two-width brand that prints its map three ways: the Horween strap pages carry 18mm Compatible with: Senate, Seeker, Signature range 20mm Compatible with: Element range, the strap variant menus repeat it in brackets, and the rendered watch spec blocks agree, so the Beaucroft chart tables the split plus the Arc, Contour GMT and Rebel families the strap sentence never names. Paulin is the brand where the movement, not the range name, holds the answer: the Paulin chart reads the rendered spec lines the merchant feed omits entirely and finds every quartz and manual Modul and OH no on 18mm while the same ranges' 39mm automatics sit on 20mm, with the Neo automatics the 18mm exception and the Mara at 20mm. Diatom is the brand that breaks the round-number rule itself: the Diatom chart reads the rendered spec lines under the store's en-eu feed prefix and finds every Terra on a fractional Lug width: 23.7mm down to 20mm while the four Legacy Collection Dots sit on 22mm, the enamel dials print no width at all, and the brand's own 24mm tyre strap claim is printed beside the 22mm the Dots print and flagged, not settled. Sher is the sparsest catalog in the database, three products and two watches, and the Sher chart holds both widths verbatim: the TWP dive prints 20mm lug width twice on one page, the kids watch prints 16mm lug width with its 37.5mm lug-to-lug flagged as a length, not a width, and the bracelet's 20mm to 16mm taper quoted so nobody buys a strap four sizes too small. DONE Watches is the six-family three-width catalog: 18 live Mechanica watches tabled from their own pages, B at 22mm, C, Chrono and F at 20mm, D and E at 18mm, and the DONE Watches chart decodes the strap shop's 22/18 and 20/18 and 18/16 taper titles so the second number is never mistaken for a width. Jowissa is the six-width catalog read from the feed itself: 531 watches typed Wrist Watch across 8, 12, 15, 18, 20 and 22mm, and the Jowissa chart rolls them up family by family and splits the Tiro trap by reference, because J4.570.M is 18mm while J4.570.L is 22mm. Airain is the one-width catalog: 11 of its 14 watch pages attest 20mm at the lugs across three spec vocabularies and the other three print no width at all, and the Airain chart renders all fourteen pages, decodes each vocabulary, and flags the Size: 18mm on the spec sheets as the buckle end. Momentum is the five-width catalog: 14mm on the Mini Eclipse up to 22mm on the M50, with the same case size carrying different widths three times over, and the Momentum chart renders all 124 product pages, reads every width from the 60 numeric spec blocks, refuses the 23 combined listings that render labels only, and documents the M-Ocean's 18mm lugs against the oversize-strap folklore. Whitby Watch Co is the two-width catalog with the split inside the family: every Arrow and Canuck pilot page prints 20mm for the 39mm case and 22mm for the 43mm in one sentence, and the Whitby chart tables all 56 rendered watch pages, eight of them honestly marked not stated by maker. Heron is the single-width catalog where the confirmation is the value: all 37 watch pages print Lug Width: 20mm, including the 37.5mm Mirabel GMT and 37mm Continental that look like 18mm watches, and the Heron chart certifies it against the complete 62-row feed with zero exceptions. Haigh & Hastings is the four-spelling catalog: Classic and M2 Diver at Lug Width: 22.0 mm, Profile at Lug Width: 20mm, Reef Break behind the compact Lug: 24mm, and the AR24 behind the typo Lug With: 22mm, all tabled in the Haigh & Hastings chart. Waldor & Co is the eight-width catalog that proves the case number never decides: all 69 watch rows print a Lug width line, 10mm on the Venia 24 up to 24mm on the Chrono 48, with the Montel 40 at 22mm beside the 20mm Original 40 and a chrono-39 handle that is really a 44mm watch at 22mm, and the Waldor chart tables all 17 families verbatim. AndoAndoAndo is the opposite problem: only 33 of 160 store rows state a width at all, every vinyl edition on the same 22mm cushion case, so the AndoAndoAndo chart is a stated-width confirmation table with a separate no-spec list that refuses to guess. By Enoksen is the three-evidence-class catalog: the width prints in the feed, in the rendered SIZE & FIT block, or on the strap page's compatibility line, and the four Krono E08 pages print none of these in their spec blocks, so the Enoksen chart assembles the map and names the class on every row. Manufaktur Waldhoff is the catalog that states its width in six different spellings and never leaves a watch unstated: 147 of 147 watch rows carry a width line, from Strap width: 22mm measured at the lugs through Bracelet width: on the Vanguard V8 and Strap: Calf leather. 22mm on the Ultramatic II to the Quasar's dual 20mm leather / 22mm titanium sentence, so the Waldhoff chart tables all 24 families and splits the 20mm Navigator and Atlas GMT lines from the 22mm majority that the 41mm case size does not predict. Out of Order is the brand that states the same measurement eight ways and still leaves a third of its catalog silent: the Out of Order chart tables all 145 stated rows, from LUG WIDTH: 22 mm on the Forma Venti to the one-line WIDTH: 22 mm lug width | 20 mm buckle width pairs on the Night Ops and Safari Bronze, flags the 18mm deployant clasp printed next to them that is not a strap width, and lists the 67 models the maker leaves unstated rather than backfilling them. Addiesdive is the warehouse-split catalog with the 19mm problem: the Addiesdive chart reads the width line under all six of the brand's spec labels (Lug Width, Band width, Bandwidth, Lug Size, Lugs width/strap width, and one 20mm lug width buried in marketing copy) across 392 feed rows, consolidates the India, US and Australia warehouse duplicates into 150 models, and finds every single 36mm quartz and explorer model on 19mm lugs while the brand's own strap shop sells no 19mm band at all. Bonest Gatti is the brand where the width ignores the strap industry: the Bonest Gatti chart reads the Strap Width line on all 89 watches in the maker's feed and finds twelve widths from 12mm to 30mm, with 53 models on sizes (21, 23, 24, 25, 26, 27, 30mm) that a default strap dropdown does not offer, including a 39mm dial that takes 26mm and a 47mm dial that takes 20mm. BENLYWATCH is the brand that states a half millimeter: the BENLYWATCH chart reads the Strap width size line on all 56 stated watches in the maker's feed and finds a 17.5mm half-width class of three watches (Redline, Mobius X5000, GL570) that the maker's own strap shop sells nothing for, a 21mm class on the same case as its 20mm majority, a lone 24mm Mk, and one stated 42MM outlier carried as stated with a warning. Sans Arret is the maker that states the number everyone else hides: the Sans Arret chart reads the STRAP WIDTH line on all 41 watches in the maker's feed, finds the collection name decides everything (18mm PRISM/SAROS, 20mm AMBITIONIST and REWIND, 21mm ELEMENT, 24mm DOMINATOR on a 31mm case), and split-cells the one row that prints both ends of its integrated taper, STRAP WIDTH 24.0mm*18.0mm, so the buckle width is never mistaken for the lug width. Alkin is the three-model brand where the width is the model differentiator: the Model One takes 22mm on a leather strap that tapers to 20mm at the buckle while the Model Two and Model Three take 20mm on steel bracelets, and the Alkin chart tables all 16 watch rows from the maker's own spec blocks with the lug and buckle widths split, so the Model One's 22/20 pair never collapses into one wrong number. Helgray is the dormant catalog where the case size is the trap: the same 42mm case prints Lug Width : 20 mm on the GMT and Field Officer watches and Lug Width : 22 mm on the Hornets, the 40mm cases split Silverstone 20 against Poseidon diver 22, and the Helgray band size chart reads the 21 stated rows in the maker's own feed, carries the two render-rescued rows the feed lost, and lists the ten no-width models instead of guessing them. Knut Gadd is the dual-form catalog with the lug-distance trap: the Cult Diver states 20 mm lugs / 48 mm lug distance in one sentence where only the 20 is a width, the Decagon and Octagon pages print bullet-form Strap width lines instead, and the Knut Gadd band size chart tables the 15 stated rows from both forms with the lug-to-lug in its own column, corroborated by the strap shop's own fit sentences. CHOOSZ is the art-watch catalog with the length-label trap: its spec blocks print Strap size - 23CM lines in centimeters one row away from the true width under Strap width size, and the CHOOSZ band size chart charts the 18 stated rows across six classes, from the 18mm core of eight through the 17.5mm half-width pair never rounded, the 20-24mm adjustable range kept unsplit, down to the 9mm Mercury Drops and the 7mm Void Lattice no standard strap shop stocks. ARC & Co. is the Japan-designed two-watch catalog where the feed states nothing and the renders state everything: TYPE ART-DECO prints Lug width: 18.0mm beside a Butterfly clasp / 18mm that stays straight to the clasp, WORLD TIME prints Lug width: 20mm four times while its 46.6mm lug-to-lug sits one line up waiting to be misread, and the 20mm-to-18mm bracelet taper is Kickstarter-campaign text the ARC & Co. band size chart cites at its source instead of passing off as a store spec, with the ghost NEO-VINTAGE rows search engines still carry disclosed as retired. Makoto Watch Company is the same-model size-confusion case: the Kodawari stone dials take 20MM Lug Width in the 39mm case and 19MM in the 37mm case, the Track collabs print Lug Width: 22 mm beside a 36 mm lug-to-lug, and the Nagomi line hides the width under a second label, 20MM Lug Opening, so the Makoto band size chart tables all 15 watches under both labels with the maker's own 20mm-only strap shop flagged as corroboration, not a size guide. JIOS is the catalog that needs two languages: GMT Diver's 104 prints Lug width: 20mm on every dial, Seiran and Biwa print Lug width: 18mm across 61 listings, the cushion-case Awazu prints the width between lugs: 14mm in its own word order, and the Omi's English the width between lugs: 38mm is a mistranslated lug-to-lug that the maker's Japanese page resolves to a band lug width of 18mm, all tabled in the JIOS band size chart. Corniche is the family that splits by line and spells it three ways: the Heritage 40 prints Lug Width: 22 mm, the Heritage Chronograph and La Grande Corniche print Lug Width: 20 mm, the Heritage 36 prints Lug Width: 18mm with no space while the Visionnaire and Historique print Lug Width: 18 mm with one, and the maker's strap shop sells one strap per line at the same widths, all tabled in the Corniche band size chart. Black Corner is the escaped-data catalog: Sailing Stones 18mm, Star Nero 20mm, the Wormhole 22mm tapering to 20mm, all stated only inside structured markup invisible to text scrapers, two of the three editions already closed, tabled with per-row status in the Black Corner band size chart. Oceaneva is the value-before-label brand: 22mm across the whole strap-wearing fleet with the maker's own shop selling only 22mm FKM straps, and a 24mm Lug Width For Bracelet tapering to 17mm on the square Tenuis Ultra-Thin that no standard strap serves, all tabled with every trap number adjudicated in the Oceaneva band size chart.

Width is not length, and neither is case size

Three different numbers get called "watch band size" and they answer three different questions:

• Lug width (this page) decides whether the strap physically attaches to your watch.
• Strap length (written like 115/75mm) decides whether it wraps your wrist with a sensible amount of tail. A 7 inch wrist and an 8 inch wrist take different lengths of the same 20mm strap; see our strap size by wrist size chart, or the NATO strap length guide for one-piece nylon bands. Once the width and length are right but the fit is still off, adjusting the band (links, clasp, or a new leather hole) finishes the job. Measuring an existing band to replace it, or sizing the spring bar pins themselves? That is covered in the spring bar sizes and band measuring guide.
• Case size decides how the watch head looks on your wrist, and it is really a lug-to-lug question; that is what our calculator, the case size by wrist table, and the lug-to-lug explainer are for. You will also find lug-to-lug and thickness numbers for 25 popular watches in the watch database.

Jewelry follows the same pattern with different numbers: a bracelet is sized like strap length (wrist measurement plus an allowance you choose) and a bangle is sized off your hand instead, and the bracelet and bangle measuring guide works through both with charts.

Sources

• Standard width chart and width-by-case mapping: watchband.direct band size guide (16-24mm table with case ranges), tailorsizeguide.com watch size chart (strap width by case diameter), and cnswatchbands.com strap sizing guide, cross-checked against superglobalcalculator.com (2mm-step standard widths).
• 1mm-too-wide / 1mm-too-narrow fit failure and even-vs-odd widths: watchband.direct and epochstraps.com guides, both stated explicitly.
• Taper and buckle width rules: cnswatchbands.com and epochstraps.com. Thickness bands: epochstraps.com.
• Rolex lug widths: honcosstraps.com Rolex lug width table, elestraps.com Submariner strap size page, and everestbands.com Rolex dimensions by reference (three sources, all in agreement).
• Speedmaster Professional 20mm: delugs.com Speedmaster strap pages, bernardwatch.com spec listing (42mm case, 20mm lug width), cnswatchbands.com. Seamaster Diver 300M 20mm: augleather.com Omega strap guide, flyback.ai reference specs, cnswatchbands.com.
• MoonSwatch 20mm (all missions): watchbandit.com MoonSwatch strap guide, delugs.com FAQ, strapsco.com MoonSwatch page.
• Tudor widths: vgreenco.com Tudor strap reference, mgbwatches.com Tudor strap listing, cnswatchbands.com Black Bay guide; Pelagos 39 at 21mm additionally confirmed by Hodinkee's hands-on (which corrected its own initial 20mm figure to 21mm).
• Seiko 5 SNK807/805/809 at 18mm (37mm case): strapsco.com model page, watchbandexpert.com original Seiko strap listing, ewatchparts.com fitment listing.