Want to know which Apple Watch model you have? It's easier than you think. Apple has released dozens of models over the years — from the original Apple Watch Series 0 in 2015 to the latest Apple Watch Series 11, Ultra 3 and SE (3rd generation) in 2025. Many models look very similar, making it tricky to identify your Apple Watch without the exact model number. To determine your Apple Watch model, you'll need that model number. In this guide, we'll walk you through step by step how to find it and compare it with our complete overview of all Apple Watch model numbers.
Tip: The model number always starts with the letter A (followed by 4 digits). Once you have it, look it up in the overview below.
Step 1 — Find your Apple Watch model number
A
On your Apple Watch
Settings → General → About → 'Model' field
B
Via the Watch app on iPhone
My Watch → General → About → tap 'Model' to see the A-number
Step 2 — Compare your model number and identify your Apple Watch
Bands for 38, 40, 41 and 42 mm (Series 10 & 11) are interchangeable
Bands for 44, 45 and 49 mm are interchangeable
Not sure about your size? Check the back of your watch
Series 10 and 11 come in 42 mm and 46 mm — thinner and lighter than previous generations
Ultra models always have a 49 mm case size
Frequently asked questions about Apple Watch models
Not entirely. Bands are compatible within two groups: 38/40/41/42 mm (small case, including Series 10 & 11) and 44/45/49 mm (large case). Within those groups, bands are interchangeable across series. Note: Apple Watch Series 1–3 also had a 42 mm case, but that falls in the large band category and is not compatible with the 42 mm of Series 10 and 11.
Look at the side of your watch. Models with Cellular have a red ring on the Digital Crown. GPS-only models have a white/grey ring. You can also check at Settings → General → About → Model.
The newest models (2025) are the Apple Watch Series 11, Apple Watch Ultra 3 and the Apple Watch SE (3rd generation).
Yes! A Series 9 band of 41 mm fits on the Series 10 and 11 with a 42 mm case — both fall in the small band category (38/40/41/42 mm). A Series 9 band of 45 mm fits on the Series 10 with a 46 mm case — both fall in the large band category (44/45/49 mm). View all bands.
The serial number (not the same as the model number) can also be found via Settings → General → About. You can also find it on the original packaging or via checkcoverage.apple.com.
The Apple Watch SE is the affordable entry-level option without advanced health sensors like ECG and blood oxygen measurement. The Series models (e.g. Series 9, 10, 11) are the flagships with all features, a brighter display and faster chip. The Ultra models are designed for extreme sports and adventure, with a larger 49 mm titanium case and enhanced GPS accuracy.
Apple Watch bands are compatible in two size groups. Do you have a watch with 38, 40, 41 or 42 mm (small case — including Series 10 & 11)? Then all bands from the small category will fit. Do you have a watch with 44, 45 or 49 mm (large case)? Then all bands from the large category will fit. Note: the older 42 mm case of Series 1–3 falls in the large category and doesn't share bands with the new 42 mm of Series 10 and 11. View the complete band range.
Can't figure out which model you have? Our team is happy to help.