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.
Stop shipping AI renders that lie about size. Learn the accurate-scale method.
A practical guide for jewellery brand owners using AI to generate product visuals. Covers the anchor-measure-verify method behind the free True-Scale tool, so every render you publish is true to the piece's real dimensions.
- ·Anchoring a known dimension in any AI-generated image
- ·Verifying feature sizes in true millimetres before you publish
- ·Why AI models render jewellery oversized, and how to catch it
- ·Exporting an annotated spec sheet for casting and quality checks