Fit Guide

Find Your Strap Size

Three numbers make a strap fit: your lug width, your buckle width and your strap length. Each Justvero strap is cut to order from these numbers. This guide walks you through each one in a few minutes. Not sure about any of them? Tell us your watch and we'll check before we cut.

A watch case seen from above with the strap removed and an arrow across the gap between the lugs, marked 20 mm

At a glance

18–22 mmThe lug width of most watches
Whole mmLug widths are almost never fractional
20 / 18Lug width / buckle width: the usual way strap sizes are written
16–18 cmWhere most wrists fall (115/70 to 125/75 mm)

Step 1

What Is Lug Width?

Lug width is the gap between the two lugs of your watch case. The lugs are the small arms that hold the strap. It is measured in millimetres, straight across the space where the strap sits.

This is the one number that has to match exactly. A strap that is too narrow shifts between the lugs and leaves a visible gap. A strap that is too wide will not fit between them at all.

Three Ways to Find It

Check your current strap
Turn your strap over. The size is often stamped on the lining near the lug end, as a single number like "20" or as a pair like "20-18". The first number is your lug width.
Look up your watch
Search your watch brand and model plus "lug width". Manufacturer pages and watch databases usually list it in the specifications.
Ask us
Turn on "Add your watch details for a precise fit" in the configurator and enter your watch brand and model, or email cs@justvero.com. We confirm the lug width before we cut your strap. There is no charge for this.

Measure It Yourself

Lay the watch face-up
Place your watch on a flat surface. The strap can stay on, but removing it gives a clearer view of the lugs.
Place a ruler across the lugs
Lay a millimetre ruler or caliper across the gap, close to the case, where the strap meets the watch.
Read inner edge to inner edge
The distance between the inner edges of the lugs is your lug width. Round to the nearest whole millimetre: 19.7 mm is a 20. If you're unsure, measure again in good light or send us a photo.

Three Common Mistakes

Case size is not lug width. A "40 mm watch" means the case diameter. The lug width is a separate, smaller number, usually around half the case size.

Measure the inner edges. Measuring from the outer edges of the lugs adds a few millimetres.

Lug-to-lug is a different measurement. Lug-to-lug is the length from the tip of the top lugs to the tip of the bottom lugs. It tells you how a watch sits on the wrist, not how wide the strap should be.

Widths we make: every whole millimetre from 12 to 24 mm. Watch outside this range? Email cs@justvero.com before ordering.

Step 2

Taper and Buckle Width

Most leather straps get narrower from the watch toward the buckle. This narrowing is called the taper. Strap sizes are usually written as two numbers: 20 / 18 mm means 20 mm at the watch and 18 mm at the buckle.

Only the first number has to match your watch. The second number, your buckle width, is a style choice. A strap with more taper looks lighter and dressier. A straight strap looks bolder and sportier.

Every Justvero strap comes with a buckle sized to the buckle width you choose. So you don't need to measure a buckle unless you plan to use your own.

Choose Your Taper

Once you pick your lug width, the configurator shows up to three taper choices with their exact millimetres, and pre-selects the most popular one (marked with a star). Tap another to change it.

Taper	Buckle end	Example on a 20 mm watch	Looks best with
Straight	Same width as the lug end	20 → 20 mm	Larger, sporty and tool watches
Classic	Up to 2 mm narrower	20 → 18 mm	Most watches: the traditional proportion
Slim	More than 2 mm narrower	20 → 16 mm	Dress and smaller watches; a lighter, tapered look

Buckle widths run from 10 to 22 mm and are never wider than the lug. So 14–22 mm lugs show all three choices; 12–13 mm lugs have no Slim option, and 23–24 mm lugs have no Straight option. Want a different buckle width? Tap "Other width".

Diagram: measure the inside distance between the two sides of a buckle, where the strap attaches — 21 mm in the example — not the outside width

Using Your Own Buckle or Deployant?

If you want to reuse a buckle or deployant clasp you already have, the strap's buckle width must match it. Measure across the inside of the buckle frame, where the strap passes through, in millimetres. Choose that number with "Other width" (it must be no wider than your lug width), then turn on Watch details and tell us you're keeping your own buckle.

A strap laid flat with the lug width, buckle size, long end and short end labelled

Step 3

Strap Length

A two-piece strap has a long side, which has the adjustment holes, and a short side, which carries the buckle. Lengths are written long / short. For example, 115 / 70 mm is a 115 mm long side and a 70 mm short side. Both are measured without the buckle.

The easiest way to choose is to measure your wrist and use the chart below.

Two Ways to Find Your Length

Measure your wrist
Wrap a soft tape measure, or a strip of paper you then lay against a ruler, around your wrist just above the wrist bone, where you wear your watch. Keep it snug against the skin but not tight. The chart already allows for a comfortable fit. Measuring in inches? Multiply by 2.54.
Or measure a strap that fits
If you already have a strap that fits well, lay it flat. Measure the long side from the lug end to the tip, then measure the short side from the lug end to where the buckle attaches, without the buckle. In the configurator, choose Custom length and enter both numbers.

Size Chart

Find your wrist size, rounded to the nearest centimetre. In the configurator these appear under "Length — by wrist size".

Your wrist	Strap length (long / short)
14 cm · 5.5 in	105 / 65 mm
15 cm · 5.9 in	105 / 70 mm
16 cm · 6.3 in	115 / 70 mm
17 cm · 6.7 in	115 / 75 mm
18 cm · 7.1 in	125 / 75 mm
19 cm · 7.5 in	125 / 85 mm
20 cm · 7.9 in	135 / 85 mm
21 cm · 8.3 in	135 / 95 mm
22 cm · 8.7 in	135 / 105 mm
Other	Custom length: enter long and short in mm

Fine-Tuning Your Length

Between two sizes? Choose the larger one, or enter a custom length.

Large or thick watch (around 44 mm and up)? The case covers more of your wrist, so consider one size shorter.

Like a looser fit? Go one size longer.

Still unsure? Turn on "Add your watch details for a precise fit", write your wrist size in Model / Notes, and we'll check the length before we cut.

Diagram comparing a curved end, cut to follow the watch case so it sits flush, with the straight end supplied by default

Straight or Curved End?

The straight end is the standard. It fits every watch and leaves a small gap where a rounded case meets the strap.

A curved end (+$12) is cut to follow the curve of your watch case, so the strap sits flush with no gap. It is made for a specific case shape, so please add your watch brand and model, and a photo if you can. If you're not sure, keep Straight and tell us your watch. We'll advise before we cut.

Common Questions

Do you make odd widths like 19 or 21 mm?

Yes. Many watches, especially vintage pieces, use odd widths. Every whole millimetre from 12 to 24 mm is in the list and made with the same care.

My watch measures about 19.5 mm. What should I order?

Measure again from inner edge to inner edge, close to the case. It is almost certainly a whole number. If you're still unsure, send us your watch model or a photo and we'll confirm.

Do I measure at the top or the bottom of the lugs?

On almost every watch the gap is the same all the way down. Measure close to the case, where the strap actually sits.

I don't have a caliper. Is a ruler accurate enough?

Yes. Lug widths are whole millimetres, so a ruler read carefully at the inner edges is enough.

Does the strap come with a buckle and spring bars?

Yes. Every strap includes a buckle sized to your buckle width and quick-release spring bars fitted to the strap, so you can change straps without tools.

I'm between two wrist sizes.

Choose the larger size, or select Custom length and enter your exact long and short lengths.

Can you make a size that isn't listed?

For length, yes: choose Custom length and enter your long and short sides in millimetres. For buckle width, use "Other width". For a lug width outside 12–24 mm, email cs@justvero.com before ordering.

Can you check my sizes before you make the strap?

Yes. Turn on "Add your watch details for a precise fit" in the configurator and enter your watch brand and model. A photo is optional. We review the fit before cutting. You can also email cs@justvero.com.