US to Japan ring size

Convert a US ring size to Japan — instantly, and with the exact millimetre diameter so you can order with confidence.

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I know my size in Value

Your size is US 7 (UK N½, EU 54).

Measurement check Exact table match

Measurement check Standard chart conversion; final fit still depends on band width and knuckle shape. Confirm with a printable or physical sizer before ordering an expensive ring.

17.32 mm Circ mm 54.4 mm

US: 7
UK: N½
EU / ISO: 54
Japan: 14
CH / IT / ES: 14
Inner diameter, millimetres: 17.32
Circ mm: 54.4

Why this size?

Your input maps to US 7 — UK N½, EU 54, JP 14, Ø 17.32 mm.

Calculated dimensions are rounded chart values, not a measured accuracy guarantee. Ruler placement, print scale, screen calibration and the finger can change the result. Confirm with a physical sizer before ordering.

Open US 7 size guide

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Converter chart
US	UK	EU	JP	CH	Inner diameter, millimetres	Circ mm
3	F½	44	4	4	14.07	44.2
3.5	G½	45	5	5	14.48	45.5
4	H½	47	7	7	14.88	46.8
4.5	I½	48	8	8	15.29	48.0
5	J½	49	9	9	15.70	49.3
5.5	K½	51	10	11	16.10	50.6
6	L½	52	12	12	16.51	51.9
6.5	M½	53	13	13	16.92	53.1
7	N½	54	14	14	17.32	54.4
7.5	O½	56	15	16	17.73	55.7
8	P½	57	16	17	18.14	57.0
8.5	Q½	58	17	18	18.54	58.3
9	R½	60	18	20	18.95	59.5
9.5	S½	61	19	21	19.35	60.8
10	T½	62	20	22	19.76	62.1
10.5	U½	63	22	23	20.17	63.4
11	V½	65	23	25	20.57	64.6
11.5	W½	66	24	26	20.98	65.9
12	Y	67	25	27	21.39	67.2
12.5	Z	68	26	28	21.79	68.5
13	Z½	70	27	30	22.20	69.7

US-to-Japan conversion chart

US-to-Japan conversion chart
US	Japan	Inner diameter, millimetres	Circ mm
3	4	14.07	44.2
3.5	5	14.48	45.5
4	7	14.88	46.8
4.5	8	15.29	48.0
5	9	15.70	49.3
5.5	10	16.10	50.6
6	12	16.51	51.9
6.5	13	16.92	53.1
7	14	17.32	54.4
7.5	15	17.73	55.7
8	16	18.14	57.0
8.5	17	18.54	58.3
9	18	18.95	59.5
9.5	19	19.35	60.8
10	20	19.76	62.1
10.5	22	20.17	63.4
11	23	20.57	64.6
11.5	24	20.98	65.9
12	25	21.39	67.2
12.5	26	21.79	68.5
13	27	22.20	69.7

Frequently asked questions

How do I convert a US ring size to Japan?

Enter your US size in the converter above, or find it in the chart below and read across to the Japan column. Both use the same canonical chart on Ringsizely.

Are US and Japan ring sizes the same?

No — they use different scales, so the numbers do not match and must be converted. International equivalents are approximate; when possible, order by millimetre diameter.

How should I confirm a converted ring size before ordering?

Measure the same finger or a ring that fits with a second method. For an expensive, wide, or non-resizable ring, check the retailer's chart and confirm with a physical sizer or jeweller.

Explore

See the full international ring size chart · Ring Size Conversions — All Systems & Sizes · EU→US

Values computed from the US jewellers’ diameter scale and cross-checked against ISO 8653 — methodology last reviewed 2026-08-27. Methodology