Ring Size Calculator
Buying a ring online? Measure your finger circumference or a ring's inner diameter in millimeters, and this calculator converts to US, UK, and EU ring sizes instantly. Essential for engagement rings, wedding bands, and online jewelry shopping.
How to measure your finger:
- Wrap a strip of paper or string snugly around the base of your finger
- Mark where the ends meet
- Measure the length in millimeters - this is your circumference
- Alternatively, measure the inner diameter of a ring that fits well
Tips for accurate measurement:
- Measure at the end of the day when fingers are slightly larger
- Measure at room temperature (cold shrinks fingers)
- Account for knuckle size - the ring must pass over it
- Measure multiple times and average the results