Sizing
What size watch should I buy?
Choose watch size by lug-to-lug length, not case diameter: the distance from lug tip to lug tip should not exceed the flat width of your wrist. As a rough starting rule, 36–40mm cases suit wrists around 6–7 inches (15–18cm), and 40–44mm suits wrists above roughly 7.5 inches (19cm) — but proportion beats any fixed number.
Why lug-to-lug is the real number
Case diameter ignores the lugs, which are the part that actually overhangs the wrist. Two watches both labeled "40mm" can wear completely differently depending on how far the lugs extend, how curved they are, and the bezel width — which is why fit-focused buyers measure lug-to-lug against their wrist's flat top width, not diameter.
If the lug-to-lug measurement exceeds your wrist's flat width, the watch will visually and physically overhang, regardless of how modest the diameter figure looks on paper.
Other dimensions that matter
Case thickness affects how a watch sits under a cuff and how it feels day to day — dress watches often stay under 10mm, dive watches commonly run 12–15mm or more. Lug width (18mm, 20mm, 22mm are common) determines which straps and bracelets fit. Style also shifts the ideal: dress watches lean smaller and thinner for a clean cuff line, while dive and field watches run intentionally larger for legibility and grip.
Frequently Asked Questions
Is 42mm too big for a small wrist?
It depends on lug-to-lug, not the 42mm figure alone. A 42mm watch with a short, tight lug-to-lug can wear smaller than a 40mm watch with long, flaring lugs.
How do I know my wrist size for a watch?
Measure wrist circumference with a flexible tape for strap sizing, and measure the flat width across the top of your wrist in millimeters to compare directly against a watch's lug-to-lug spec.
Does watch thickness matter as much as diameter?
For comfort under a cuff and day-to-day feel, often yes — a thick case can feel bulkier than diameter alone suggests, especially on smaller wrists.
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