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Apple Watch Band Sizing Guide

Universal size combination	Compatible models	Case size
38mm丨40mm丨41mm丨42mm	Apple Watch	38mm
	Series 1
	Series 2
	Series 3
	Series 4	40mm
	Series 5
	Series 6
	SE
	Series 7	41mm
	Series 8
	Series 9
	SE2
	Series 10	42mm
42mm丨44mm丨45mm丨46mm	Apple Watch	42mm
	Series 1
	Series 2
	Series 3
	Series 4	44mm
	Series 5
	Series 6
	SE
	Series 7	45mm
	Series 8
	Series 9
	SE2
	Series 10	46mm
44mm丨45mm丨49mm	Ultra	49mm
	Ultra 2

Core Principles: Two Size Categories

Apple Watch strap compatibility can be simply divided into two series: " small size " and " large size ".

• Small size universal series (38mm / 40mm / 41mm)

  • If you have an Apple Watch with a 38mm, 40mm, or 41mm case, all bands listed in those three sizes are compatible with each other. For example, a band designed for a 41mm Series 9 will fit perfectly on an older 38mm Series 3.

• Large size universal series (42mm / 44mm / 45mm / 49mm)

  • Likewise, if you own a watch with a 42mm, 44mm, 45mm, or 49mm (Apple Watch Ultra) case, all bands listed in those sizes are also compatible. For example, an off-road band designed for an Apple Watch Ultra (49mm) will also work perfectly with a 44mm Apple Watch SE.

How do I determine my Apple Watch case size?

The quickest way to find out is to flip over to the back of your watch . Around the circle surrounding the heart rate sensor, you'll see engraved text that clearly indicates your case size, such as "41MM" or "45MM."

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