EU Ring Size to UK Ring Size Converter

Summary

EU ring sizes state the inner circumference of a ring in millimeters, while UK ring sizes use a letter scale from A to Z and beyond. This tool takes an EU size or a measured circumference and finds the closest UK letter size using a standard jewelry sizing chart, along with the ring diameter. It is useful when buying a ring from a UK retailer, resizing a ring bought in Europe, or comparing sizes across two different sizing systems.

How it works

1. Enter the EU ring size, or a circumference you measured, in millimeters.
2. The tool matches it to the closest size on a standard EU-to-UK sizing chart.
3. The UK letter size, circumference, and diameter appear instantly.
4. If your value falls between two chart sizes, the tool shows how far off the nearest match is.
5. Scroll the reference table to see every size with your match highlighted.

Use cases

• Buying a ring from a UK jeweler when you only know the EU size printed inside a ring.
• Resizing a ring bought in Europe at a UK jewelry shop.
• Converting a ring size from an EU online store before checkout.
• Checking a ring inherited or gifted from abroad against a UK sizing chart.
• Comparing a measured finger circumference to standard UK letter sizes.

Frequently Asked Questions