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Printable Watch Strap Ruler & Lug-Width Gauge

No calipers? Print this page to get a true-size millimetre ruler, a gauge with bars from 16 to 24mm for checking lug width, and a bank-card box to confirm it printed at the right scale.

MILLIMETRE RULER0102030405060708090100110120130140150160170LUG-WIDTH GAUGELay the watch face-down on a bar: the right size fills the gap between the lugs exactly.16mm17mm18mm19mm20mm21mm22mm24mmPRINT CHECKThis box is 85.6mm wide: a bank cardshould match its width exactly.If it doesn't, reprint at 100%%or “Actual size” (turn off“Fit to page”).watchstrapsize.com

How to print it at the right size

  1. Print on A4 or US Letter with the scale set to 100% or Actual size. Turn off “Fit to page” or “Shrink to fit”.
  2. Check the result: a bank or credit card should exactly cover the width of the dashed box (85.6mm). If it doesn't, your printer scaled the page.

How to use the lug-width gauge

Lay the watch face-down with its lugs straddling a grey bar. The bar that fills the gap between the lugs exactly, with no light either side and without having to force the watch down, is your lug width, and that's the strap size you buy. If one bar is slightly loose and the next won't fit, choose the looser one: a strap a touch narrower than the gap is fine; a wider one is not.

For a finer reading, use the ruler across the inside edges of the lugs, or try the on-screen ruler. Then look your watch up in the strap size finder to confirm, or check the strap size chart.