Watch Size Guide: Which Case Size Is Right?
The right size makes a watch comfortable and good-looking. Measure your wrist and use the table below.
Updated 11 November 2026
Measure your wrist
Wrap a tape or strip of paper around your wrist just above the wrist bone and measure it in centimetres.
Case size by wrist
- Wrist 15 to 16.5 cm: 34 to 38 mm
- Wrist 16.5 to 18 cm: 38 to 41 mm
- Wrist 18 to 20 cm: 40 to 44 mm
- Ladies: 26 to 36 mm
Examples
- 36 mm: Rolex Datejust 36 126234 Luxury Dress Watch
- 39 to 40 mm: Tudor Black Bay 58 M79030N-0001 Swiss Dive Watch, Rolex Explorer 40 224270 Luxury Sports Watch
- 41 to 42 mm: Rolex Submariner Date 41 126610LN Luxury Dive Watch, Omega Seamaster Diver 300M 210.30.42.20.01.001 Luxury Dive Watch
- Ladies: Rolex Lady-Datejust 28 279174 Ladies Watch, Cartier Panthere de Cartier Small WSPN0006 Ladies Luxury Watch
Thickness and lug-to-lug
Thickness and the distance between the lugs matter as much as the diameter. Square watches such as the Cartier Tank and Santos wear larger than their size.