How to Size a Watch Strap
Watch straps are measured by length and width/taper. Length is important to make sure your strap fits snuggly and comfortably around your wrist. Width is important because you need your strap to be the right size to fit into your watch case. Taper is the width at the buckle and does not influence the fit of your strap.
How to Measure Watch Strap Length
The instructions below explain how to exactly measure your watch size whether you’re measuring from a strap that fits well or from your wrist size.
Using your current watch strap
Start by measuring the distance from the hole you use to fasten your watch to the spring bar that holds the strap in place (A). Then measure the distance between the spring bars to get the width of your watch (B). Then measure from the other spring bar to the pin that holds the buckle in place (C). Make sure to measure in millimeters.
A: Spring Bar hole to the hole used on your old strap.
C: Spring Bar to end of Buckle Side Strap (Do not include the buckle)
Use the sum of A + C as your reference number and refer to the chart below.
Chart coming soon! Email firstname.lastname@example.org your measurements to get your size.
By measuring your wrist
Measure the circumference of your wrist in millimeters. Then subtract the width of the watch case you plan on using (B in the diagram above). So wrist circumference - B + 16 = your reference number. Find your reference number in the chart below to find your strap size.
How to Measure Watch Strap Width:
There are two important measurements when it comes to the width of watch straps: lug width and taper. When you see a watch strap measurement like this: 20/18mm, the first number (20) is the lug width, and the second number (18), is the taper.
This is the width of the strap where it connects to the watch case (see D in the diagram). Lug width varies from one watch model to the next, so it is really important to know the lug width of your watch case.
The second important measurement is the taper. This is the width of the strap at the buckle. In the diagram above, you can see that in the C section of the strap, it is narrower at one end than the other. The taper, where the strap meets the buckle, is narrower than the lug width, where the strap meets the watch case.
Straight straps have no taper. If you see a strap size that is only one number (like 18mm) it is straight. This shows that the strap is 18mm for the full length, lug and buckle. Whereas a size like 20/18mm indicates that the strap is 20mm at the lug and 18mm at the buckle.
Should I pick a tapered or straight watch strap?
Whether you choose a tapered or straight strap is entirely personal preference. People often choose a tapered strap to accentuate the size of the watch case. Straight straps tend to look simpler and more rugged, while tapered straps are more elegant. You might have one of each for your watch depending on how you feel!
If you want your wrist to look bigger, a straight strap is better. Some watch wearers find that tapered straps, which emphasize the size of the watch case, can also give the illusion of a smaller wrist.
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