Why lug-to-lug matters most
The case diameter is printed in every listing, but whether a watch looks right depends on how far the lugs reach across the top of your wrist. If the lugs overhang the edges of the wrist, the watch looks too big however small its diameter. A 42 mm watch with short, curved lugs can fit better than a 40 mm watch with long, straight ones.
The rules of thumb used here
Visible wrist width ≈ wrist circumference × 0.30
Good fit: lug-to-lug ≤ visible wrist width
Typical case size: about 34–38 mm under 16 cm wrists, 38–42 mm for 16–18 cm, 40–44 mm for 18–20 cm, 42 mm+ above 20 cm
Wrists are oval and flat-topped to different degrees, so treat these as guides. Case thickness matters too: over about 13 mm, a watch sits high and catches on shirt cuffs.
Strap length
Straps are listed as two lengths, like 120/75 mm (long side with holes / buckle side). Roughly: wrists up to 16 cm use short straps (about 110/70), 16–19 cm regular (120/75), 19–21 cm long (125/80 or more). Bracelet watches are adjusted by removing links.
Questions people ask
Is a 44 mm watch too big for a 17 cm wrist?
Where do I find lug-to-lug size?
Do women’s and men’s watches follow the same rules?
Sources
- Rule-of-thumb sizing as used by watch retailers and reviewers
Results are estimates to help you plan. Always confirm important numbers with the seller, carrier or authority concerned. Last reviewed: November 2026.