How to Choose the Right Watch Strap Size: Lug Width Explained

Buying a new watch strap should be exciting — not confusing. But with measurements in millimetres, references to "lug width" and "buckle width," and integrated designs that don't follow standard rules, it's easy to order the wrong size.

This guide breaks down everything you need to know about watch strap sizing, so you can order with confidence the first time.

What Is Lug Width?

The lug width is the single most important measurement when buying a watch strap. It's the distance between the two lugs — the horn-like projections on the top and bottom of your watch case — where the strap attaches using spring bars.

Lug width is always measured in millimetres (mm), and it determines what size strap will fit your watch. Get this wrong, and the strap either won't fit at all or will look sloppy and insecure.

How to Measure Your Lug Width

Method 1: Check the Case Back

Many watch manufacturers print the lug width (or the full model number, which you can look up) on the back of the watch case. Remove the watch from your wrist, flip it over, and look for engraved or printed numbers.

Method 2: Use a Ruler or Caliper

If the case back doesn't list the lug width, measure it yourself using a metric ruler or digital caliper. Measure the distance between the inside edges of the lugs. Even a 1mm difference means the strap won't fit properly, so measure carefully.

Method 3: Look Up Your Watch Model Online

Search for your watch model followed by "lug width" or "specifications."

Common Lug Widths by Watch Type

| Watch Type | Common Lug Widths | |---|---| | Women's dress watches | 12–14mm | | Unisex/compact watches | 14–16mm | | Mid-size dress watches | 18–20mm | | Standard men's watches | 20–22mm | | Large sport watches | 22–26mm |

Integrated vs Standard Straps

Most watches use standard straps — any strap of the correct lug width will fit. However, some watches have integrated bracelet designs where the strap flows seamlessly into the case. These require purpose-built straps. The Tissot PRX is the most notable example.

What About Strap Length?

Most standard watch straps fit wrists between 15cm and 20cm (6–8 inches). If you have a larger wrist, our extra long watch strap collection offers extended-length options.

Quick Sizing Checklist

1. Identify your watch model
2. Find the lug width (case back, ruler, or online lookup)
3. Check if your watch needs an integrated strap
4. Select the correct lug width when browsing
5. Consider strap length if you have a larger wrist

Need help? Contact the Watchlove team with your watch model and we'll guide you to the right strap.