Watch Strap Sizing Explained – How to Choose the Right Size for Your Watch

Choosing the right size strap is just as important as picking the right style or material. If your strap is too short, too long, or doesn’t fit the lugs, it can ruin the comfort and look of your watch. This guide will walk you through the basics of watch strap sizing so you get the perfect fit — every time.

1. Lug Width – What Connects Your Strap to the Watch

Lug width is the distance between the two lugs on your watch case where the strap connects. It’s measured in millimeters (mm), and common sizes include 20mm, 22mm, and 18mm. Always use a strap that matches your watch’s lug width to ensure a secure and flush fit.

Not sure what your lug width is? Use our

Strap Finder Tool

2. Strap Length – Ensuring a Comfortable Fit

Strap length refers to how the strap wraps around your wrist. A good fit means the strap’s tail doesn’t stick out too much or fall short of the keeper loop. Standard lengths fit most wrists, but larger or smaller wrists may need long or short options.

3. Taper – The Look and Feel Down the Strap

Taper is the difference in width from the lugs to the buckle. Some straps start wide at the lugs and narrow near the clasp, giving a sleek, elegant look — especially on leather straps. Sportier straps like rubber may keep a consistent width for a bolder feel.

4. Match Size and Style to Your Watch Brand

Some watches are known for specific lug widths and case fits. For example:
- Most Omega Seamaster and Speedmaster models use 20mm or 21mm
- Rolex models like the Submariner use 20mm lugs
- MoonSwatch and IWC models also vary, so make sure you measure or check specs

Find brand-specific straps for

Omega, Rolex, and MoonSwatch

The easiest way to find your fit? Just use our

Strap Finder Tool

It shows you all compatible straps for your exact model in seconds.

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Helvetus homepage

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Helvetus is not affiliated with any watch brands. All names are for compatibility reference only.