Choosing the right band size for your Apple Watch Series 3 isn’t just about comfort—it’s also about ensuring compatibility and style. If you’ve recently picked up an Apple Watch Series 3 or want to upgrade your current band, you might be wondering: What band size fits my Apple Watch Series 3?
This guide breaks down everything you need to know about Apple Watch Series 3 band sizes, including case size compatibility, wrist size recommendations, and which bands to choose for a snug and stylish fit.
Apple Watch Series 3 Case Sizes
The Apple Watch Series 3 comes in two case sizes:
- 38mm
- 42mm
These sizes refer to the vertical height of the watch case—not the width of the band. Each case size works with specific band sizes designed to match the lugs (where the band connects to the watch).
Which Band Sizes Fit the Apple Watch Series 3?
Apple designed the Series 3 with backward and forward compatibility in mind. That means you can mix and match bands across different generations—as long as the band size matches the case group.
Compatibility Breakdown:
| Case Size (Series 3) | Compatible Band Sizes |
| 38mm | 38mm, 40mm, 41mm bands |
| 42mm | 42mm, 44mm, 45mm bands |
So, if you have a 38mm Series 3, you can use newer bands made for 40mm or 41mm watches. If you have a 42mm Series 3, bands for 44mm or 45mm Apple Watches will also fit perfectly.
Apple Watch Band Styles and Size Ranges
Different bands are designed for different wrist sizes and purposes. Here’s a breakdown of the most popular band types compatible with Apple Watch Series 3 and how they fit.
Sport Band
A flexible and durable choice for everyday wear.
- 38mm / 40mm / 41mm:
- S/M: fits 130–180mm wrists
- M/L: fits 150–200mm wrists
- 42mm / 44mm / 45mm:
- S/M: fits 140–190mm wrists
- M/L: fits 160–210mm wrists
Sport Loop
Soft, breathable, and adjustable—great for workouts.
- 38mm / 40mm / 41mm: fits 130–200mm wrists
- 42mm / 44mm / 45mm: fits 145–220mm wrists
Solo Loop / Braided Solo Loop
Designed to slip on and off without a clasp—these bands come in specific sizes from 1 to 12.
- Use Apple’s printable sizing guide to find your size based on wrist measurement
- Compatible with 38mm, 40mm, 41mm or 42mm, 44mm, 45mm depending on your Series 3 case size
Milanese Loop
Stylish and magnetic stainless-steel mesh band for a premium look.
- 38mm / 40mm / 41mm: fits 130–180mm wrists
- 42mm / 44mm / 45mm: fits 150–200mm wrists
Leather Link / Modern Buckle
Fashion-forward options ideal for formal or casual looks.
- Available in sizes Small, Medium, Large depending on band and case
- Not all leather options are available for Series 3, so double-check compatibility
How to Measure Your Wrist for the Right Fit
To make sure your new Apple Watch band fits comfortably:
- Use a flexible measuring tape or a string to measure around your wrist
- Match the measurement to the band’s sizing range
- If you’re between sizes (especially for Solo Loop), it’s often better to size down for a snug fit
Apple also offers a printable sizing tool specifically for Solo Loop bands.
Can You Use Newer Bands with Series 3?
Yes! Despite its age, the Series 3 supports many of the newest band styles. As long as the band is within the matching case size group (38mm with 40mm/41mm; 42mm with 44mm/45mm), it will fit and function just fine.
Best Band Options for Series 3 in 2025
Here are a few popular and reliable band choices for Apple Watch Series 3 users in 2025:
| Band Type | Best For | Price Range |
| Sport Band | Everyday use, workouts | $49 |
| Sport Loop | Active lifestyles | $49 |
| Solo Loop | Minimalist look | $49 |
| Milanese Loop | Formal settings | $99 |
| Braided Solo Loop | Fashion and comfort | $99 |
Third-party options are also widely available for more affordable prices, though quality may vary.
Where to Buy Compatible Bands
You can buy Apple Watch bands from:
- Apple Store (online or retail)
- Amazon (look for “Made for Apple Watch” compatibility)
- Best Buy, Target, and other tech retailers
- Etsy or custom shops for unique designs
Always check the size and compatibility info before purchasing.
FAQs
What size band does Apple Watch Series 3 use?
The Series 3 comes in 38mm and 42mm case sizes. Bands made for 38mm/40mm/41mm will fit the 38mm Series 3, and bands made for 42mm/44mm/45mm will fit the 42mm version.
Can I use a 41mm band on my 38mm Series 3?
Yes. Bands made for 41mm are compatible with the 38mm Series 3 case.
Can I use a 45mm band on my 42mm Apple Watch?
Yes. 42mm and 45mm bands use the same connection lugs and will fit your Series 3.
What’s the best band for small wrists?
The Solo Loop or Sport Band (S/M size) are great choices for smaller wrists due to their snug fit and size options.
Are all Apple Watch bands compatible with Series 3?
Not all, but most. As long as the band matches the Series 3 case size group (38mm or 42mm), it should be compatible.