China / HK

Ring sizes in China.

China has no national ring standard. Most jewellers use a numeric scale equivalent to the Japanese one, but some quote the ISO circumference instead. Sending the millimetre measurement removes all ambiguity.

The number means: Integer scale equivalent to the Japanese 号数 scale
Written as: a whole number — 港号

Measure my China / HK size

Worth knowing: China has no national ring standard. Most jewellers use the Japanese-equivalent number shown here (港號), but some quote the ISO circumference instead. Send your jeweller the millimetre measurement to be certain.

China / HK sizes converted

Every row is calculated from the published standards, so the columns stay consistent with one another.

Scroll the table sideways to see every region

Ring sizes in China converted to other national standards
China / HK	Diameter	Circum.	US / CA	UK / AU	EU / ISO	France	DE / NL
7	14.88 mm	46.8 mm	4	H½	47	47	15
8	15.29 mm	48.0 mm	4½	I½	48	48	15.5
9	15.69 mm	49.3 mm	5	J½	49.5	49.5	15.5
10	16.10 mm	50.6 mm	5½	K½	50.5	50.5	16
12	16.51 mm	51.9 mm	6	L½	52	52	16.5
13	16.91 mm	53.1 mm	6½	M½	53	53	17
14	17.32 mm	54.4 mm	7	N½	54.5	54.5	17.5
15	17.73 mm	55.7 mm	7½	O½	55.5	55.5	17.5
16	18.13 mm	57.0 mm	8	P½	57	57	18
18	18.54 mm	58.2 mm	8½	Q½	58	58	18.5
19	18.95 mm	59.5 mm	9	R½	59.5	59.5	19
20	19.35 mm	60.8 mm	9½	S½	61	61	19.5
21	19.76 mm	62.1 mm	10	T½	62	62	20
22	20.16 mm	63.3 mm	10½	U½	63.5	63.5	20
24	20.57 mm	64.6 mm	11	V½	64.5	64.5	20.5
25	20.98 mm	65.9 mm	11½	W½	66	66	21
26	21.38 mm	67.2 mm	12	X½	67	67	21.5
27	21.79 mm	68.5 mm	12½	Z	68.5	68.5	22
29	22.20 mm	69.7 mm	13	Z+1	69.5	69.5	22

Need a standard that isn’t shown? The full conversion chart lists all11 side by side.

Calibration

Calibrate with something in your pocket.

You don’t need a bank card. Our sizer knows the published diameter of coins from your currency, so you can calibrate with whatever is nearest.

¥1

25 mm across

People’s Bank of China coin specifications

€1

23.25 mm across

European Central Bank coin specifications

€2

25.75 mm across

European Central Bank coin specifications

Buying from abroad

If you’re ordering from a retailer that uses a different scale, don’t translate the size yourself and hope. Send them the inside diameter in millimetres — every workshop in the world can work from that, and it removes the rounding step where errors creep in.

The reason is that the scales have different step sizes. A whole size in one system rarely lands exactly on a whole size elsewhere, so somebody has to round. Better that it’s the jeweller holding your measurement than a chart guessing at it.

Get my measurement How to measure

Ring sizes in other countries

See every system side by side in the full ring size chart