While the band of an Apple Watch can be altered, the case size must be selected before purchasing the watch. This Apple Watch sizing guide has been compiled to assist you in making the most appropriate purchase.

Back in 2018, Apple's wearables ushered in a brand-new benchmark for their sizes. As a direct consequence of this, the Apple Watch 6 and the Apple Watch SE are now offered in two different sizes: 40mm and 44mm.

Both the 38mm and the 42mm cases can be purchased for the first three generations of Apple Watches, including the Series 3 model (which can still be purchased).

But now, thanks to the latest iteration of the Apple Watch, the Apple Watch 7, we have more choices than we ever have before. We are now getting a bit more specific than increasing the measurement range to 41mm and 45mm.

Do you find it difficult to decide which model of the Apple Watch best suits your needs? Let's begin by discussing how to determine the circumference of your wrist and what the four different models have in common.

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How to Determine the Correct Apple Watch Size for Your Wrist

Before purchasing an Apple Watch or an alternative band, it is imperative that you measure the circumference of your wrist. This is true even though the fit of your watch is a matter of personal preference.

But on what grounds do you base your assertion? To determine the size of your wrist, you need to take out a flexible measuring tape and measure it.

Place the tape measure around your wrist just below where the bone in your wrist protrudes and approximately where you would normally wear the band, and then align it with the specifications of the watch you intend to purchase.

The average size of a small wrist is between 5 and 6.5 inches, whereas the average size of a large wrist is between 7 and 8.5 inches. The good news is that many of the bands for the Apple Watch can be customized to achieve a specific fit by utilizing velcro or threading them through the holes of sports straps.

Be careful not to make the band excessively tight or too loose; not only will it be uncomfortable, but it will also throw off the accuracy of the heart rate monitor on the Apple Watch.

Apple Watch Sizes

Apple Watches are available in sizes of 38mm, 42mm, 40mm, and 44mm.

Let's take a look at each category so we can understand which models are appropriate for particular fits.

Apple Watch Series First Edition all the way up to Third Edition

Apple Watches of the first three generations are available in either a 38mm or 42mm case size. Because of this, there was a significant disparity in wrist sizes, and in general, wrists that were generally thin on both men and women were left to be on the smaller side.

Starting with Apple Watch Series 4 and going up to Apple Watch Series 6

Apple, realizing that these casings might be a little too small, moved their sizing up to 40mm and 44mm, finding that the wrist range fit much better than the previous generations while still letting their customers with slimmer wrists to choose the earlier series. This was done so that thinner-wristed customers would have the option to purchase a watch that was sized appropriately.

As a result of the fact that not everyone was interested in upgrading to the larger Apple Watch Series 7 model, the Apple Watch SE also ended up falling into this category.

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Apple Watch Series 7

There were still some adjustments that needed to be done, so Apple went back and added another millimeter to each of its available choices. For the convenience of their clients, the Series 7 was manufactured in both 41mm and 45mm widths.


According to Apple's documentation for the Apple Watch Series 7, the 41mm bands are compatible with both the 38mm and 40mm cases. The 45mm straps are compatible with both the 42mm and the 44mm casings. Therefore, in a nutshell, the new Apple bands are compatible with Apple Watch Series 3 and later models, including the Apple Watch SE.

Taking Into Account All of the Measurements

Although the straps will always play a role in determining how precisely the gadget will fit on your wrist, these measurements will give you an idea of how large the bezel is. In addition, in contrast to the vast majority of other companies, Apple measures the Watch in a vertical rather than a horizontal fashion.

Putting Together Your Arguments

Consider that the 40mm variation has a width of 34 millimeters, a depth of 10.7 millimeters, and a case weight of approximately 30 grams. For the larger 44m model, you will have to make do with a casing that has a width of 38 millimeters, a depth of 10.7 millimeters, and a weight of 36 grams.

The width of the 38mm model is 33.3 millimeters, while the width of the 44mm model is 35.9 millimeters. Both of these devices have a depth of 10.5 millimeters, making it so that there is virtually no difference between them and the Series 4 in this regard.

These sizes are essential for selecting which face will look best on your wrist. Thus, it is a good idea to cut out a paper counterpart to evaluate on your wrist – or go to an Apple store and try on all four sizes – if you want to know which face will look best on your wrist.

Please look at the Apple Watch SE Genius Choice Page we've made for you so that you can locate what you're looking for, compare costs, and select your preferred retailer and offer. In addition, take a look at the table below to compare some of your available choices.

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The Importance of Choosing the Most Appropriate Band

The degree to which the band is tight and the type of material it is made of naturally have the greatest influence on comfort.

Apple provides a detailed reference on each of its band types (Classic Buckle, Modern Buckle, Link Bracelet, and Sport, Milanese Loop), some of which require you to select an mm size when purchasing, and others (like the Sport bands) which come with both a small/medium and a medium/large strap for you to choose from.

Also, take in mind that any bands that work with Series 1 through Series 3 will correlate to the larger or smaller size of the Series 4 or Series 5 series. Consequently, a Series 2 band measuring 38 millimeters can be used with a Series 5 measuring 40 millimeters.

You can also choose from an assortment of bands sold by third-party vendors for your Apple Watch. They are almost always available at a lower cost, and many are replicas of Apple's models in terms of their appearance.

We hope that you found our guide on Apple Watches' sizes helpful.


Passionate about understanding and contributing to a world that does not stop changing. New forms of Work, Sustainability and Technology. For many years he has worked as a creative for large international companies. He has a Ph.D. in information technology and he has been doing quantitative research in the interdisciplinary areas of information systems, cyber security, data analytics and artificial intelligence. He continue to look for creative solutions through technology to help companies to be more humane and sustainable..

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