The Watch Size Guide: What Actually Fits

A watch can be technically perfect and still look wrong if the size is off. Sizing a watch is simple once you understand three numbers: case diameter, lug to lug and thickness.

Measure your wrist first

Wrap a flexible tape around your wrist just behind the wrist bone. No tape? Use a strip of paper and mark it, then measure it against a ruler. Most men fall between 15cm and 19cm.

• 15cm to 16cm wrist: 36mm to 40mm cases
• 17cm to 18cm wrist: 39mm to 42mm cases
• 19cm and above: 42mm to 46mm cases

Why lug to lug beats diameter

Diameter describes the case only, but lugs are what actually touch your wrist. A 42mm watch with long lugs can wear bigger than a 44mm with short lugs. As a rule of thumb, your lug to lug should be under half your wrist circumference. On a 17cm wrist, that means roughly 45mm or less.

Thickness and weight

Thick automatic watches can catch on shirt cuffs and feel heavy by evening. For everyday wear, aim for 10mm to 12mm thickness. If you want something that disappears under a cuff, look for 9mm and under, which usually means quartz or a slim dress watch.

The mirror test

Finally, stand at arm's length in front of a mirror. In the reflection, the lugs should stay inside the width of your wrist. If the watch is so wide it covers the full flat of the wrist, size down. This test catches everything the numbers cannot.