Find Your Apple Watch Size

Sizing

Find your Apple Watch size

It's engraved on the back of your watch — no measuring required.

01 Take your Apple Watch off your wrist
02 Turn it over and look at the back
03 Find the number followed by mm, engraved near the top
The back of an Apple Watch with the 44mm case size engraved near the top
Then choose your band size
38 / 40 / 41 / 42mm
Small case
44 / 45 / 46 / 49mm
Large case

There are only two sizes to choose from. Small covers 38, 40, 41 and 42mm. Large covers 44, 45, 46 and the 49mm Ultra. Every Apple Watch model uses one of these two fittings, so once you've picked the right one, it fits — no compatibility to worry about.

One thing to remember: the number on the back is your case size, not your wrist size.