Watch Size Fit Guide

Case diameter should track wrist circumference: under 15 cm wrists suit 34–38 mm, 17–19 cm suits 42–44 mm, and so on — the proportion rule c

Quick answer: Case diameter should track wrist circumference: under 15 cm wrists suit 34–38 mm, 17–19 cm suits 42–44 mm, and so on — the proportion rule collectors Free, instant, private — runs entirely in your browser.

How to use

  1. Fill the fields above — results update as you type.
  2. Adjust any input to compare scenarios instantly.
  3. Nothing is uploaded; everything runs in your browser.

About this tool

Case diameter should track wrist circumference: under 15 cm wrists suit 34–38 mm, 17–19 cm suits 42–44 mm, and so on — the proportion rule collectors use.

FAQ

Watch Size Fit Guide — is it really free?
Yes. No signup, no watermark, no hidden limit — the logic runs entirely in your browser and nothing is uploaded.
Does Watch Size Fit Guide store my inputs?
No. Everything is computed on your device; closing the tab erases it all.

Rate this tool

Your rating stays in this browser (local storage) — nothing is sent to any server.