Conversion · Japan to United Kingdom

Japan / China to UK / Australia ring sizes.

Japan / China 14 = UK / Australia M 16.79 mm across · 52.7 mm around

Both scales describe the same physical ring. The table below converts every size in the range, derived from inner circumference rather than copied.

Japan / China	UK / Australia	Diameter	Circumference
1	D	12.99 mm	40.8 mm
2	D½	13.28 mm	41.7 mm
3	E½	13.58 mm	42.7 mm
4	F	13.87 mm	43.6 mm
5	G	14.16 mm	44.5 mm
6	G½	14.45 mm	45.4 mm
7	H	14.74 mm	46.3 mm
8	I	15.04 mm	47.2 mm
9	I½	15.33 mm	48.2 mm
10	J½	15.62 mm	49.1 mm
11	K	15.91 mm	50.0 mm
12	L	16.20 mm	50.9 mm
13	L½	16.50 mm	51.8 mm
14	M	16.79 mm	52.7 mm
15	N	17.08 mm	53.7 mm
16	N½	17.37 mm	54.6 mm
17	O½	17.66 mm	55.5 mm
18	P	17.95 mm	56.4 mm
19	Q	18.25 mm	57.3 mm
20	Q½	18.54 mm	58.2 mm
21	R½	18.83 mm	59.2 mm
22	S	19.12 mm	60.1 mm
23	S½	19.41 mm	61.0 mm
24	T½	19.71 mm	61.9 mm
25	U	20.00 mm	62.8 mm
26	V	20.29 mm	63.7 mm
27	V½	20.58 mm	64.7 mm

Measure in the evening — fingers swell through the day and in heat — and let your jeweller's own chart take precedence over this one. How to measure at home →