Changing an Apple Watch strap takes seconds and needs no tools. The only thing to get right is the size, and that comes down to your watch's case size, not your wrist. Here's how to find it, which straps fit, and how to pick one you'll love.
Step 1: find your case size
Your case size is the height of the watch in millimetres, and it's printed on the back of the case. You'll see a number such as 41mm, 45mm or 46mm.
If you can't read it, open the Watch app on your iPhone and go to General, then About. It shows the model, and the table below tells you the size.
Step 2: check which straps fit
Apple Watch straps come in two size groups. Any strap from the same group will fit, even across different series:
- Smaller watches: 38mm, 40mm, 41mm and 42mm (Series 10 to 12).
- Larger watches: 42mm (Series 1 to 3), 44mm, 45mm, 46mm and 49mm.
| Apple Watch | Case sizes |
|---|---|
| Series 1, 2 and 3 | 38mm or 42mm |
| Series 4, 5, 6 and SE (all generations) | 40mm or 44mm |
| Series 7, 8 and 9 | 41mm or 45mm |
| Series 10, 11 and 12 | 42mm or 46mm |
| Ultra, Ultra 2, Ultra 3 and Ultra 4 | 49mm |
Watch out for 42mm
42mm means two different things. On the Series 1 to 3 it was the larger size, but on the Series 10, 11 and 12 it's the smaller size, and the straps don't swap. On our strap pages, the 42mm options are labelled by series so you can't mix them up.
Just bought a Series 12?
The Series 12 uses the same straps as the Series 10 and 11, so any strap for a 42mm or 46mm Series 10 fits the matching Series 12.
When you buy, choose your exact case size on the strap page. The fit is then made for your watch, so you won't need to worry about the groups at all.
Step 3: choose a material
- Silicone is soft, waterproof and easy to clean, which makes it the one for the gym, swimming and everyday wear.
- Leather gives your Apple Watch a classic look that works at the office or a wedding. It's best kept away from water.
- Vegan leather has the same smart look, with no animal materials.
- Nylon is light and breathable, and the loop styles adjust to any wrist.
- Metal bracelets are the smartest of the lot, and they're tough enough to wear every day.
Step 4: choose a fastening
- Buckle: the classic watch fastening, found on most leather straps.
- Pin and tuck: a stud pushes through a hole and the end tucks under, as on Apple's own sport bands. It's quick and secure.
- Loop: a magnetic or hook-and-loop closure that you can adjust to any point, so you always get a perfect fit.
- Hook (Alpine-style): a metal hook that's very hard to knock open, which makes it ideal for hiking and sport.
How to change an Apple Watch strap
Turn the watch over and press the small band release button next to the strap. Keep it pressed and slide the strap sideways out of its slot. Slide the new strap in until it clicks, then do the other side.
Our guide on how to change your Apple Watch strap has step-by-step photos.
Common questions
How tight should an Apple Watch strap be?
Snug enough that the sensors on the back stay against your skin, but loose enough to slide a little finger underneath. Many people loosen it a touch after a workout.
Will an Ultra strap fit my 46mm or 45mm watch?
The 49mm Ultra is in the larger group, so it shares the same slot, but the strap ends are shaped for the Ultra's case. For the neatest fit, choose your exact case size on the strap page.
Are your straps made by Apple?
No. They're made to fit the Apple Watch, but they aren't made by or connected with Apple. Your Apple Watch isn't included.
Ready to choose?
Browse all our Apple Watch straps, or get in touch and we'll help you find the right one.