Ring Size Calculator - US, UK & EU Sizes
Find your ring size from finger circumference or diameter. Convert between US, UK, EU, and international ring size standards with a printable sizing guide.
Formula
Circumference = Diameter ร ฯ
Ring sizes are standardized based on the inner diameter or circumference of the ring. Different regions map these dimensions to different scales (Numbers for US, Letters for UK).
Frequently Asked Questions
How do I measure my ring size at home?
Wrap a strip of paper around your finger base. Mark where the ends meet. Measure the length (circumference) in mm and use Ring Size Calculator - US, UK & EU Sizes.
What if I am between sizes?
It is usually best to size up, especially for wider bands which feel tighter. A ring that is too loose is easier to fix than one that cuts off circulation.
Does band width affect ring size?
Yes. Wider bands (over 4-5mm) fit tighter than thin bands. You typically need to go up 0.5 to 1 full size for a wide ring.
What is the average ring size?
The average women\'s ring size is US 6-7. The average men\'s ring size is US 9-10.