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Ring Size Calculator

Convert ring circumference or diameter to ring size in US, UK and EU formats.

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US Size
UK Size
EU Size
Diameter (mm)

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How Ring Sizes Work

Ring sizes are based on the inner circumference or diameter of the ring. Sizes vary by country — a US size 7 = UK size N = EU size 54.

Measuring Your Ring Size

Frequently Asked Questions

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 — that is your circumference.
Should I measure in the morning or evening?+
Fingers swell during the day. Measure in the evening when your fingers are at their largest for a comfortable fit.

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