[OPTO WATCH CO.] | How to calculate your watch strap size?


To calculate your ideal strap length, you’ll have to measure your wrist size.

How to measure?

  • Start by wrapping a soft tape measure around your wrist at the point where you desire your watch case to sit.
  • Make a mark where the tape overlaps using a pen or pencil.
  • Lay the tape flat and make a mental note of your wrist size.
  • Or simply take the measure of a strap you already have and like!

Here is a chart to help you decide what is your idea strap size:

Wrist size Strap Length
150-164mm  120/70mm
165-178mm 125/75mm 
179-190mm 130/80mm
191-203mm  135/85mm


Tapered straps At OPTO WATCH CO. 

We offer strap in different tapering sizes, we tapper down 2 or 4mm. Now we stock 19/16, 20/16, 21/60, 22/18, 20/18, 22/20 and 22/22.

Largest straps collection

With over 300 strap under one website, we guarantee that you find what are you looking for.

Explore OPTO