Guidance
Finding your size.
Measure the inside of a ring you already wear. It is more reliable than measuring your finger, and you can do it with a ruler.
The accurate method
Take a ring that fits the finger you have in mind. Measure straight across the inside, from edge to edge, at the widest point. That distance is the inside diameter, in millimetres.
Measure twice. A third of a millimetre is close to half a size, so it is worth being careful.
Inside diameter to US size
| US size | Inside diameter |
|---|---|
| 4 | 14.9 mm |
| 5 | 15.7 mm |
| 6 | 16.5 mm |
| 7 | 17.3 mm |
| 8 | 18.1 mm |
| 9 | 18.9 mm |
| 10 | 19.8 mm |
| 11 | 20.6 mm |
| 12 | 21.4 mm |
Between two sizes, take the larger. A ring that is slightly loose can be worn; one that is slightly tight cannot.
Things that change the answer
Fingers are larger at the end of the day, in warm weather, and after exercise. Measure at a normal moment, not an extreme one.
A wide band sits more snugly than a narrow one at the same size. For a broad ring, consider going up a half size.
Knuckles matter. The ring has to pass the knuckle and then sit comfortably below it. If the difference is large, size for the knuckle.
If you are still unsure
Write to us before ordering. Telling us the measurement you took and the piece you are considering is quicker than guessing, and it is the sort of question we would rather answer twice than have you get wrong once.