UK J to Japan Ring Size
Conversion
UK J = Japan 9
Inner circumference ≈ 49.3 mm · diameter ≈ 15.7 mm.
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Full conversion chart
| Region | Size |
|---|---|
| US | 5 |
| UK | J |
| EU | 49 |
| France | 49 |
| Japan | 9 |
About this conversion
A UK J ring converts to a Japan 9. Inner circumference ≈ 49.3 mm · diameter ≈ 15.7 mm. Ring sizes all describe one physical measurement — the inner circumference of the band — that each country labels differently.
To check at home, measure the inside diameter of a ring that already fits and compare it to the millimetre figure above.