Ring Sizer
Convert a ring size between UK, US, and EU, measure an existing ring on screen, or print a sizer sheet to check at home. It runs entirely in your browser and nothing is uploaded.
How it works
Calibrate your screen
Hold a card up to the screen and drag the guide to match its width, so every size shown on screen is true to life.
Convert or measure
Look up a UK, US, or EU size in the conversion table, or measure an existing ring against the on-screen circles.
Print and check
Print the sizer page at 100% scale, not fit to page, and check the ruler line. Compare a real ring against the circles before you order or cast.
Screen calibration and printed sheets are guides, not a replacement for a physical ring sizer. Screen brightness, browser zoom, and printer scaling can all introduce small errors, so always confirm an important size with a physical sizer before you order or cast.
Want the full accurate-scale workflow guide?
This tool is free to use right now, no email needed. The guide below is optional: it walks through the anchor-measure-verify method behind True-Scale, our other free tool.
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