Conversion
Japan 5 = France 45
Inner circumference ≈ 45.5 mm · diameter ≈ 14.5 mm.
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Full conversion chart

RegionSize
US3.5
UKG
EU45
France45
Japan5

About this conversion

A Japan 5 ring converts to a France 45. Inner circumference ≈ 45.5 mm · diameter ≈ 14.5 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.