RingSizeChartsFree · No sign-up · Works on mobile
Free Ring Size Calculator & International Chart
Measure your ring size at home in 2 minutes. Instant conversion across US, UK, EU, Japan & China standards.
- 3 measuring methods
- 6 international sizes
- Nothing to install
Wrap a string around your finger
Measure at the end of the day, when fingers are largest.
Learn before you buy
Free guides on measuring, converting sizes, and picking rings that fit.
Frequently asked questions
Everything about measuring and buying with confidence.
Within about one size when you measure carefully. It's a guide — for engagement or expensive rings, confirm with a jeweller.
This is a guide, not a professional jeweller's measurement. When unsure, size up half a size.