Have a ring that fits?
Use a ring that fits the same finger on the same hand.
Place your ring on a ruler. Measure straight across the centre in millimetres, inner edge to inner edge — excluding the metal.
Wrap a narrow paper strip around the base of your finger, snug but not tight. Mark where it meets, lay it flat and measure the length in millimetres. Check that the loop also passes over your knuckle.
A wide ring or a prominent knuckle? Check the fit with us before ordering.
Prefer an app?
Third-party tools may include ads or paid features. Follow the app’s calibration instructions; results do not guarantee fit.
iPhone · App StoreAndroid · Google PlayRing size chart
EU size is based on the inner circumference in millimetres. The calculator rounds to a whole size: below .5 down, .5 and above up. US is approximate, rounded to the nearest half size; order by EU size. Available sizes vary by design.
| EU | US ≈ | Inner diameter (mm) |
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