Watch strap questions, answered with measurements
Every answer rests on a measurement, not an opinion. The numbers come from the same database the watch pages are built on, and each one says how many watches stand behind it.
41,485watches measured
241brands
9answers
2026-10-24measured on
Width
The watch decides this number. How to look it up, how to measure it, and the common mistakes.
- Does lug width change within the same watch family?70.3% of watch families use more than one lug width. Knowing the family is not enough.70.3%
- What is the most common lug width on watches?20 mm, on 36.4% of measured watches. What the rest of the distribution looks like.20 mm
- Can a watch have an odd lug width like 21 mm?One watch in six takes an odd size. 21 mm is not a rounding error.18.2%
- Does the case size tell you the strap size?No. At 42 mm, watches take 20 different lug widths, and the most common one covers only 39.3%.20 sizes
- What is lug width on a watch?The gap between the lugs, in whole millimetres: the one number a strap has to match. What it is and what it is not.
- How do I measure the lug width of my watch?Measure the gap between the lugs of the case, not the case diameter. Three steps and the two mistakes to avoid.
Length and fit
Your wrist decides this number. Plus the watches that take no standard strap at all.
Your watch probably has its own page already
Each of the 41,485 measured watch references has its own page, with its lug width and the watch straps made in that size.
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