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Size charts

Watch size chart

For a 6.5 to 7 inch (16.5 to 17.8 cm) wrist, a watch case of about 38 to 42 mm usually looks right. Wrists under 6 inches suit 34 to 36 mm, and wrists of 7.5 inches or more can carry 42 to 46 mm. Men's watches typically run 38 to 46 mm, with 42 mm the most popular, and women's 26 to 36 mm. Lug-to-lug length matters as much as diameter: the lugs should not overhang your wrist.

Data checked October 5, 2026 against the sources listed below.

Wrist size to watch case diameter

Wrist size to watch case diameter

No standards body sets watch sizes. This is the overlap of published guidance from Longines, The 1916 Company, Teddy Baldassarre, Bob's Watches, Truefacet, Watches of Switzerland and others (sources below). Go 1–2 mm smaller for a dress watch and 1–2 mm larger for a sports watch.
WristWrist (cm)Case diameter
Under 6.0 inUnder 15.2 cm34-36 mm
6.0-6.5 in15.2-16.5 cm36-40 mm (core 36-38 mm)
6.5-7.0 in16.5-17.8 cm38-42 mm (centred near 40 mm)
7.0-7.5 in17.8-19.1 cm40-44 mm (core 42 mm)
7.5-8.0 in19.1-20.3 cm42-46 mm (most cite 44-46 mm)
8.0 and over in20.3 and over cm44-46 mm or larger
Watch size chart showing actual-size circles for watch case diameters from 34 mm to 46 mm34 mmsmall36 mmsmall38 mmmedium40 mmmedium42 mmmedium44 mmlarge46 mmoversized50 mm: check with a ruler after printing at 100%
Printable at actual size: print this page at 100% scale (no "fit to page") and check the 50 mm bar with a ruler.

Watch case size categories

CategoryCase diameter
Small36 mm and under (Beaverbrooks: under 38 mm)
Medium / average38-42 mm (Truefacet 37-42)
Large43-44 mm
Oversized / statement45 mm and over
Men's typical range38-46 mm (42 mm most popular)
Women's typical range26-36 mm

Lug-to-lug: the number that decides fit

Wrist or ruleGuidanceSource
Core ruleL2L must not exceed the width of your wrist ('fundamental limit')Helveti [9]
Ideal proportionL2L ideally takes up 75-95% of the wrist's widthHelveti [9]
Core rule'the lugs should never overhang the flat of your wrist'; 'Lug-to-lug distance, not diameter, is the number that determines whether a watch fits your wrist'Bob's Watches [5]
Core ruleL2L decides overhang and should stay roughly within the flat width of the wristRMS [16]
Under 6.5 in wristKeep L2L under about 45mmBob's Watches [5]
6.0-6.5 in wristL2L under 46mm; over 48mm overhangsShop Watch Direct [21]
6.5-7.0 in wristL2L 46-50mm (7 in: above 52mm starts to overhang)Shop Watch Direct [21]
7.0-7.5 in wristL2L 48-52mmShop Watch Direct [21]
7.5 in and aboveL2L up to 55mm without issueShop Watch Direct [21]

Case thickness

SourceThinAverageThick
The 1916 Company [3]under 8mm8-12mm (the same page also says 8-14mm)over 14mm
Luxury of Watches [15]6-8mm8-12mm14-18mm
Daniel Wellington [19]slim 6-8mm-9mm+
Longines (by wrist) [1]small wrists 7-9mmmedium wrists 9-12mmlarge wrists 12-15mm
Teddy Baldassarre [2]under 10mmunder 15mmover 15mm
Timex India [17]approx. 6mm-10mm and above
Watches of Switzerland / Mayors / Loupe [10][11][8]small-medium cases around 7mm-large cases around 9mm

How to measure

  1. 1

    Measure your wrist

    Wrap a soft tape or a strip of paper around the wrist where you wear a watch, just above the wrist bone, and read the length in inches or centimetres.

  2. 2

    Find your case range

    Read your wrist size across the chart to the recommended case diameter. A rough rule of thumb: the case diameter is about one fifth of your wrist circumference, so a 17 cm wrist points to about 40 mm.

  3. 3

    Check lug-to-lug

    On the watch's spec sheet, find the lug-to-lug length. It should stay within the flat top of your wrist; on a wrist under 6.5 inches, keep it under about 45 mm.

  4. 4

    Use the circles

    Print this page at 100% scale, check the 50 mm bar, cut out a circle and hold it on your wrist to see the case size before you buy.

Flat and round wrists wear watches differently

Two 6.5 inch wrists can wear the same watch differently: a flat, wide wrist gives the lugs more room than a round one. That is why lug-to-lug length, case thickness and the band all matter alongside the diameter, and why the recommended ranges overlap.

Frequently asked questions

Most guidance puts a 7 inch (17.8 cm) wrist at about 38 to 42 mm. Whether a 42 mm watch works depends on its lug-to-lug length and thickness.

42 mm. Men's watches typically range from 38 to 46 mm.

Women's watches typically range from 26 to 36 mm.

No, 40 mm sits in the medium band (about 38 to 42 mm) and suits wrists of roughly 6.5 to 7.5 inches.

The distance from the tip of the top lugs to the tip of the bottom lugs. It should not exceed the width of your wrist, and it decides fit more than the case diameter does.

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Watch size chart showing actual-size circles for watch case diameters from 34 mm to 46 mm

Sources

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