Size Guide: Apple Watch Bands & Cases
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
Then choose your size
38 / 40 / 41 / 42mmSmall case
44 / 45 / 46 / 49mmLarge case
There are only two sizes to choose from. Small fits 38, 40, 41 and 42mm. Large fits 44, 45, 46 and the 49mm Ultra. Every Apple Watch uses one of these two fittings, so once you've picked the right one, it fits.
Got a 42mm? On Series 10 and later, 42mm is the small case. On the original Apple Watch and Series 1–3, 42mm was the larger watch, so choose Large.
One thing to remember: the number on the back is your watch case size, not your wrist size.
Buying a watch case or screen protector? These are made for one exact size, so choose the exact number on the back (for example 45mm), not just small or large.
