How do I measure my ring size at home?

Wrap a strip of paper around your finger, mark where it overlaps, and measure the length in mm. This is your circumference. Enter it in the calculator to find your size.

What is the most common ring size in the UK?

The average UK ring size is L for women and R for men. However, sizes vary significantly so always measure.

Do ring sizes differ between countries?

Yes. The UK uses letters (A-Z), the US uses numbers (0.5-13), and Europe uses circumference in mm. This calculator converts between all three systems.

Should I size up or down for wide bands?

Wide bands (over 6 mm) tend to fit more snugly, so size up by half to one full size for comfort.

CraftCalcs

Ring Size Calculator — UK, US & EU Conversion

Convert between UK letter, US number and EU ring sizes with circumference and diameter measurements.

Input Type

UK Ring Size

How We Calculate This

Ring sizes are based on the inner circumference of the ring. This calculator uses the standard UK/US/EU ring size chart to convert between systems.

When you enter a circumference or diameter measurement, the calculator finds the closest standard size. The relationship between circumference and diameter is: circumference = pi x diameter.

Frequently Asked Questions

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Last updated: 2025-02-20

All calculations are estimates. Always verify quantities before purchasing materials.