Apple Sizing Chart

Compatibility First

Apple Watch Band Compatibility & Sizing

Fits all Apple Watch models—Series 1–11, SE, and Ultra 1–3 (including the new Series 11 and Ultra 3)—across case sizes 38–49 mm. Choose your connector family below, then match your wrist to S/M or M/L.


Small Connector Family

38 / 40 / 41 / 42 (Series 10–11) mm

Select bands labeled 38/40/41/42* when your Watch case is one of these sizes.

  • Series mapping: 38 (S1–S3), 40 (S4–S6/SE), 41 (S7–S9), 42 (S10–S11)
  • *This 42 mm refers to Series 10–11 only (small connector).
Large Connector Family

42 (Series 1–3) / 44 / 45 / 46 (Series 10–11) / 49 (Ultra) mm

Select bands labeled 42/44/45/46/49 when your Watch case is one of these sizes.

  • Series mapping: 42 (S1–S3), 44 (S4–S6/SE), 45 (S7–S9), 46 (S10–11), 49 (Ultra 1–3)
If your case says “42 mm”:
  • Series 10–11 (2024–2025): choose the Small connector family (38/40/41/42).
  • Series 1–3 (2015–2017): choose the Large connector family (42/44/45/46/49).

Wrist Size → Band Length

Wrist (in) Wrist (mm) Recommended Band Fit Note
5.1–7.1" 130–180 mm S/M Smaller to average wrists.
6.3–8.3" 160–210 mm M/L Average to larger wrists.
Between sizes? Pick M/L for more slack, S/M for a snug fit.

Applies to Fancy Bands silicone strap styles. Other materials (link/Milanese/elastic) may adjust beyond these ranges.

Find your case size

It’s printed on the back of your Watch (e.g., “41 mm”, “42 mm”, “46 mm”, “49 mm”). You can also check the Watch app on iPhone: My Watch → General → About.

Do Series 10–11 bands work with earlier models?

Yes—band compatibility follows the two connector families above. Match your case size to the correct family (Small or Large), regardless of series number.

Does Ultra use a different connector?

No. Ultra (49 mm) uses the Large connector family.

Can I exchange if I choose the wrong connector?

Absolutely—reach out and we’ll help with a quick exchange per our returns policy.

Note: Apple Watch not included. Band and accessories sold separately.