Size guide
Two numbers decide the fit: your watch's case size and the size of your wrist.
Your watch's case size
The model comes before the size. Apple uses the same size in millimeters for different watches, so a size alone doesn't say which band fits.
On your iPhone, open the Watch app, then go to General and About. Your watch is listed as Model Name and the size is listed in Model Detail (e.g. 42mm). You can also get your case size from your original Apple Watch receipt.
Case sizes and bands
Bands come in small and large. Each band's page says which watches it fits.
| Model | Small bands | Large bands |
|---|---|---|
| Apple Watch Ultra 4 | None | 49 mm |
| Apple Watch Ultra 3 | None | 49 mm |
| Apple Watch Ultra 2 | None | 49 mm |
| Apple Watch Ultra | None | 49 mm |
| Model | Small bands | Large bands |
|---|---|---|
| Apple Watch Series 12 | 42 mm | 46 mm |
| Apple Watch Series 12 in ceramic | 42 mm | 46 mm |
| Apple Watch Series 11 | 42 mm | 46 mm |
| Apple Watch Series 10 | 42 mm | 46 mm |
| Apple Watch Series 9 | 41 mm | 45 mm |
| Apple Watch Series 8 | 41 mm | 45 mm |
| Apple Watch Series 7 | 41 mm | 45 mm |
| Apple Watch Series 6 | 40 mm | 44 mm |
| Apple Watch Series 5 | 40 mm | 44 mm |
| Apple Watch Series 4 | 40 mm | 44 mm |
| Apple Watch Series 3 | 38 mm | 42 mm |
| Apple Watch Series 3 in ceramic | 38 mm | 42 mm |
| Apple Watch Series 2 | 38 mm | 42 mm |
| Apple Watch Series 2 in ceramic | 38 mm | 42 mm |
| Apple Watch Series 1 | 38 mm | 42 mm |
| Apple Watch (1st generation) | 38 mm | 42 mm |
| Model | Small bands | Large bands |
|---|---|---|
| Apple Watch SE 3 | 40 mm | 44 mm |
| Apple Watch SE (2nd generation) | 40 mm | 44 mm |
| Apple Watch SE (1st generation) | 40 mm | 44 mm |
Band length
Your wrist size decides the length.
Measure your wrist
Print it at 100% (Actual size), then check the 100 mm line with a ruler.
No printer? Wrap a strip of paper around your wrist, mark where it overlaps, and measure it flat with a ruler.