Watch Strap Sizes: How to Find the Right Fit for Your Watch
Getting watch strap sizes right is the difference between a strap that looks and feels great and one that doesn't fit at all. The good news is it's straightforward once you know what to measure. Here's how to figure out exactly what size strap your watch needs.
What Does "Strap Size" Actually Mean?
When we talk about watch strap size, we're mainly talking about lug width, which is the distance in millimetres between the two bars (lugs) where the strap attaches to the watch case. This is the number that matters most when buying a replacement strap.
Common lug widths are 18mm, 19mm, 20mm, 21mm, 22mm, and 24mm. Most watches fall somewhere in that range.
How to Measure Your Lug Width
You've got a few options:
Method 1: Measure the gap. Remove the current strap and measure the space between the lugs with a ruler or callipers. Callipers give you the most accurate reading.
Method 2: Measure the old strap. If you've got the original strap, measure its width where it meets the watch case. That's your lug width.
Method 3: Look it up. Most watch specifications list the lug width. Check the manufacturer's website, or use our Strapfinder tool to search by brand and model.
Method 3 is the easiest, and it's accurate. We've catalogued lug widths for thousands of watches.
Common Sizes by Watch Brand
Here's a quick reference for popular watches sold in Australia:
| Brand / Model | Lug Width |
|---|---|
| Seiko SKX007 / SKX009 | 22mm |
| Seiko Presage (most models) | 20mm |
| Citizen Promaster Diver | 20mm or 22mm |
| Orient Bambino | 21mm |
| Casio Duro MDV106 | 22mm |
| Tissot PRX | 12mm (integrated) |
| Omega Speedmaster Professional | 20mm |
| Rolex Submariner | 20mm |
| Tudor Black Bay | 22mm |
Note that 21mm is an odd size. Some people size up to 22mm for a slightly tighter fit, but a proper 21mm strap always looks better. We stock 21mm in most styles for exactly this reason. Browse our full range by size.
Does Strap Length Matter?
Yes, but it's less complicated than width. Most straps are designed for wrists between about 16cm and 20cm. If your wrist is outside that range, look for short or long options.
A strap that's too long leaves an awkward tail of excess material. Too short and you won't get it on comfortably. If you're between sizes, go longer rather than shorter. You can always tuck extra material, but you can't add length.
Strap Thickness
Thicker straps (around 3-4mm) suit chunky dive watches and sport watches. Thinner straps (1.5-2mm) look better on dress watches and vintage pieces. Matching the strap thickness to the watch case keeps everything in proportion.
What If My Watch Has Integrated Lugs?
Some watches, like the Tissot PRX or Apple Watch, use proprietary attachment systems. Standard straps won't fit these without an adapter. Always check whether your watch uses standard spring bars before ordering.
---
Frequently Asked Questions How do I know what size watch strap to buy?
Measure the gap between your watch lugs in millimetres. This is your lug width. The most common sizes are 20mm and 22mm. Our Strapfinder can look it up for you by watch model.
What is the most common watch strap size?
20mm and 22mm are the two most popular sizes in Australia. Most men's watches from Seiko, Citizen, and Orient use one of these two widths.
Can I use a 20mm strap on a 21mm watch?
Technically yes, but there will be a visible gap on each side. It's better to use a proper 21mm strap for a clean fit. We stock 21mm in most strap styles.
What size strap fits a Seiko SKX?
The Seiko SKX007 and SKX009 both use a 22mm lug width. Any 22mm strap, whether NATO, rubber, or leather, will fit.
Does strap thickness matter?
Yes. Thicker straps (3-4mm) suit sport and dive watches. Thinner straps (1.5-2mm) pair better with dress watches. Matching thickness to case size keeps the watch looking balanced.
How do I measure my wrist for a watch strap?
Wrap a flexible tape measure around your wrist where you normally wear a watch. Most standard straps fit wrists between 16cm and 20cm. If you're outside that range, look for short or long strap options.
