Watch Size Guide: How to Choose the Right Watch Size for Your Wrist
By Robert · · 5 min read
A watch that is too big looks borrowed, and one that is too small can look like an afterthought. When you buy online, you cannot try a watch on first, so it helps to know your size before you order.
This guide shows you how to measure your wrist at home, which case size suits you, and the other measurements that matter.
The measurements on a watch
When a product page lists a watch's size, it usually means one of these:
- Case diameter: the width of the case, not counting the crown (the winding knob). This is the number people mean by "a 42mm watch".
- Lug-to-lug: the length from the top strap attachment to the bottom one. This decides whether the watch overhangs your wrist.
- Thickness: the height of the case. Thin watches slide under shirt cuffs, and thick ones look sporty.
- Lug width: the width of the strap where it meets the case. This matters when you change straps. See our watch strap size guide.
Step 1: Measure your wrist
You need a piece of string or a strip of paper, a pen and a ruler (or a tape measure if you have one).
- Wrap the string around your wrist just above the wrist bone, where you would wear a watch.
- Mark the point where it meets itself. Keep it snug but not tight.
- Lay it flat against a ruler and read the length in centimetres.
Most adult wrists measure between 14 cm and 20 cm.
Step 2: Find your case size
| Wrist size | Men's watches | Ladies' watches |
|---|---|---|
| Under 15 cm (small) | 36–40 mm | 26–32 mm |
| 15–17 cm (medium) | 40–42 mm | 32–36 mm |
| 17–19 cm (large) | 42–44 mm | 36–38 mm |
| Over 19 cm (extra large) | 44–46 mm+ | 38 mm+ |
These are starting points, not rules. Plenty of women wear men's sizes for a bolder look, and many men with slim wrists like a smaller, dressier watch.
Example: the Naviforce 9230 has a 42 mm case. That is a comfortable fit for most medium and large wrists, and a bold look on a small wrist.
Step 3: Check the lug-to-lug
This is the measurement most people miss. Look at your wrist from above. The flat top part is how much room you have. If the lugs of the watch go past the edges of your wrist, it will look too big, whatever the case diameter.
As a rough guide:
- Small wrists: under about 46 mm lug-to-lug
- Medium wrists: about 46–50 mm
- Large wrists: 50 mm and over
If a product page does not list lug-to-lug, ask us. We can measure it for you before you order.
Shape changes how big a watch looks
- Round watches look the size they are listed at.
- Square and rectangular watches look bigger than the same number in a round case, because there is more case at the corners. If you like the Chenxi 604 rectangle or other square styles, you can go a size smaller than your round size.
- Thin bezels and large dials make a watch look bigger. Thick bezels make it look smaller.
- Light dials (white, silver) look larger than dark dials (black, navy) of the same size.
Size by occasion
- Office and formal: go smaller and thinner, so it fits under a shirt cuff. See our guide to executive watches for the office.
- Weekend and sport: larger and thicker is fine, and chronographs and dual-display watches suit a bigger case.
- Smartwatches: a bigger screen is easier to read but heavier. If your wrist is small, check the case size or try one in our shop first.
Ladies' watches: a quick note
Ladies' watches range from small, delicate cases around 26 mm to bold 38 mm styles. A good rule: if you want the watch to look like jewellery, stay small. If you want it to be the focal point of an outfit, go bigger. Models such as the Olevs Ladies 9945 and the Chenxi ladies range sit in the everyday middle ground. More ideas are in our ladies' watches guide.
Getting the bracelet to fit
Once the case size is right, the strap must fit too. A watch should sit snugly but let you slide one finger underneath.
- Leather and silicone straps have holes, so you can adjust them yourself.
- Steel bracelets are adjusted by removing links. Ask us to do this when you buy, or bring the watch to our Nairobi shop later. Do not force the pins out with a nail, which scratches the bracelet.
Not sure? Ask us
Send your wrist measurement on WhatsApp to +254 712 682 426 and tell us what you like, and we will suggest models that will fit. Or visit us at Scopio Business Center, 3rd Floor, Nairobi and try watches on in person.
Frequently asked questions
What size watch should a man wear? Most men are comfortable with a 40–42 mm case. Go 36–40 mm for a slim wrist under 15 cm, and 44 mm or more for a wrist over 19 cm.
What size watch should a woman wear? Most women's watches are 28–36 mm. Smaller sizes look more delicate, while 36 mm and up gives a bolder, on-trend look.
Is 42 mm too big? Not for most men. 42 mm suits wrists of about 16 cm and above. On a smaller wrist it still works as a sporty statement watch.
