Conversion
Japan 14 = UK O
Inner circumference ≈ 55.7 mm · diameter ≈ 17.7 mm.
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Full conversion chart

RegionSize
US7.5
UKO
EU56
France56
Japan14

About this conversion

A Japan 14 ring converts to a UK O. Inner circumference ≈ 55.7 mm · diameter ≈ 17.7 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.