Ring Size Guide

Measuring Ring Size

The two simplest ways to gauge your ring size are by either circumference or diameter.

The circumference of a ring measures the length around the circle. To measure: wrap a narrow strip of paper comfortably around your finger, mark the end, and measure the distance.
The diameter of a ring measures the distance across the middle inside, which can be used to gauge your ring size from a ring you are already wearing.

Printable size measuring tool.

For either measure, you can read off the appropriate sizing standard for UK & Ireland, the European Union, French, American, Swiss, Japanese or German. Of course when quoting your ring size please remember to specify which standard you are using. Note also that this system can only be used as a guide. Your local jeweller is the best place to measure your finger or ring sizes.

More about ring sizing standards:

Standard	Description	Circumference

European	The most straighforward, the European system of ring sizing, uses whole sizes equivalent to ring circumference in millimetres.	mm=EU

French	The European standard in quarter sizes.	mm=FR

Swiss	Another commonly used variation of the European system: European minus forty.	mm=CH+40

UK & Ireland	Starting at C for forty millimetres, the British Standard (BS6820 or IS8653) uses alphabetic letters for each 1.25mm of ring circumference with half sizes in between.	mm=(UK1.25)+36.3*

American	Still based on an old American inch (1.02"), the American ring size represents one tenth of an inch in circumference - further divided into quarter sizes.	in=(US.102)+1.43*

		Diameter

Japanese	Starting at thirteen millimetres inside diameter the Japanese ring standards progresses in one third of a millimetre sizes.	mm=(JP+38)/3

German	The German standard is equivalent to the metric inside diameter in quarter sizes.	mm=DE

Ring Size Calculator

Circumference¹							Diameter²
							Circumference/PI
mm	in	uk/ie	eu	us	fr	ch	mm	in	jp	de

41.00	1.61		41		41	1	13.05	0.51

41.25	1.62	D			41 1/4	1 1/4	13.13	0.52

41.50	1.63			2	41 1/2	1 1/2	13.21	0.52

41.75	1.64				41 3/4	1 3/4	13.29	0.52		13 1/4

42.00	1.65	D 1/2	42		42	2	13.37	0.53	2

42.25	1.66			2 1/4	42 1/4	2 1/4	13.45	0.53

42.50	1.67	E			42 1/2	2 1/2	13.53	0.53		13 1/2

42.75	1.68			2 1/2	42 3/4	2 3/4	13.61	0.54

43.00	1.69		43		43	3	13.69	0.54	3

43.25	1.7	E 1/2			43 1/4	3 1/4	13.77	0.54		13 3/4

43.50	1.71			2 3/4	43 1/2	3 1/2	13.85	0.55

43.75	1.72	F			43 3/4	3 3/4	13.93	0.55

44.00	1.73		44	3	44	4	14.01	0.55	4	14

44.25	1.74				44 1/4	4 1/4	14.09	0.55

44.50	1.75	F 1/2			44 1/2	4 1/2	14.16	0.56

44.75	1.76			3 1/4	44 3/4	4 3/4	14.24	0.56		14 1/4

45.00	1.77	G	45		45	5	14.32	0.56	5

45.25	1.78				45 1/4	5 1/4	14.4	0.57

45.50	1.79			3 1/2	45 1/2	5 1/2	14.48	0.57		14 1/2

45.75	1.80	G 1/2			45 3/4	5 3/4	14.56	0.57

46.00	1.81		46	3 3/4	46	6	14.64	0.58	6

46.25	1.82	H			46 1/4	6 1/4	14.72	0.58		14 3/4

46.50	1.83				46 1/2	6 1/2	14.8	0.58

46.75	1.84			4	46 3/4	6 3/4	14.88	0.59

47.00	1.85	H 1/2	47		47	7	14.96	0.59	7	15

47.25	1.86			4 1/4	47 1/4	7 1/4	15.04	0.59

47.50	1.87	I			47 1/2	7 1/2	15.12	0.6

47.75	1.88				47 3/4	7 3/4	15.2	0.6

48.00	1.89		48	4 1/2	48	8	15.28	0.6		15 1/4

48.25	1.90	I 1/2			48 1/4	8 1/4	15.36	0.6	8

48.50	1.91				48 1/2	8 1/2	15.44	0.61

48.75	1.92	J		4 3/4	48 3/4	8 3/4	15.52	0.61		15 1/2

49.00	1.93		49		49	9	15.6	0.61

49.25	1.94			5	49 1/4	9 1/4	15.68	0.62	9

49.50	1.95	J 1/2			49 1/2	9 1/2	15.76	0.62		15 3/4

49.75	1.96				49 3/4	9 3/4	15.84	0.62

50.00	1.97	K	50	5 1/4	50	10	15.92	0.63

50.25	1.98				50 1/4	10 1/4	16	0.63	10	16

50.50	1.99			5 1/2	50 1/2	10 1/2	16.07	0.63

50.75	2.00	K 1/2			50 3/4	10 3/4	16.15	0.64

51.00	2.01		51		51	11	16.23	0.64		16 1/4

51.25	2.02	L		5 3/4	51 1/4	11 1/4	16.31	0.64	11

51.50	2.03				51 1/2	11 1/2	16.39	0.65

51.75	2.04			6	51 3/4	11 3/4	16.47	0.65		16 1/2

52.00	2.05	L 1/2	52		52	12	16.55	0.65

52.25	2.06				52 1/4	12 1/4	16.63	0.65	12

52.50	2.07	M		6 1/4	52 1/2	12 1/2	16.71	0.66		16 3/4

52.75	2.08				52 3/4	12 3/4	16.79	0.66

53.00	2.09		53		53	13	16.87	0.66

53.25	2.10	M 1/2		6 1/2	53 1/4	13 1/4	16.95	0.67

53.50	2.11				53 1/2	13 1/2	17.03	0.67	13	17

53.75	2.12	N		6 3/4	53 3/4	13 3/4	17.11	0.67

54.00	2.13		54		54	14	17.19	0.68

54.25	2.14				54 1/4	14 1/4	17.27	0.68		17 1/4

54.50	2.15	N 1/2		7	54 1/2	14 1/2	17.35	0.68	14

54.75	2.16				54 3/4	14 3/4	17.43	0.69

55.00	2.17	O	55	7 1/4	55	15	17.51	0.69		17 1/2

55.25	2.18				55 1/4	15 1/4	17.59	0.69

55.50	2.19				55 1/2	15 1/2	17.67	0.7	15

55.75	2.19	O 1/2		7 1/2	55 3/4	15 3/4	17.75	0.7		17 3/4

56.00	2.20		56		56	16	17.83	0.7

56.25	2.21	P			56 1/4	16 1/4	17.9	0.7

56.50	2.22			7 3/4	56 1/2	16 1/2	17.98	0.71	16	18

56.75	2.23				56 3/4	16 3/4	18.06	0.71

57.00	2.24	P 1/2	57	8	57	17	18.14	0.71

57.25	2.25				57 1/4	17 1/4	18.22	0.72		18 1/4

57.50	2.26	Q			57 1/2	17 1/2	18.3	0.72	17

57.75	2.27			8 1/4	57 3/4	17 3/4	18.38	0.72

58.00	2.28		58		58	18	18.46	0.73		18 1/2

58.25	2.29	Q 1/2		8 1/2	58 1/4	18 1/4	18.54	0.73

58.50	2.30				58 1/2	18 1/2	18.62	0.73

58.75	2.31	R			58 3/4	18 3/4	18.7	0.74	18

59.00	2.32		59	8 3/4	59	19	18.78	0.74		18 3/4

59.25	2.33				59 1/4	19 1/4	18.86	0.74

59.50	2.34	R 1/2			59 1/2	19 1/2	18.94	0.75

59.75	2.35			9	59 3/4	19 3/4	19.02	0.75	19	19

60.00	2.36	S	60		60	20	19.1	0.75

60.25	2.37			9 1/4	60 1/4	20 1/4	19.18	0.76

60.50	2.38				60 1/2	20 1/2	19.26	0.76		19 1/4

60.75	2.39	S 1/2			60 3/4	20 3/4	19.34	0.76	20

61.00	2.4		61	9 1/2	61	21	19.42	0.76

61.25	2.41	T			61 1/4	21 1/4	19.5	0.77		19 1/2

61.50	2.42			9 3/4	61 1/2	21 1/2	19.58	0.77

61.75	2.43				61 3/4	21 3/4	19.66	0.77	21

62.00	2.44	T 1/2	62		62	22	19.74	0.78		19 3/4

62.25	2.45			10	62 1/4	22 1/4	19.81	0.78

62.50	2.46	U			62 1/2	22 1/2	19.89	0.78

62.75	2.47				62 3/4	22 3/4	19.97	0.79	22	20

63.00	2.48		63	10 1/4	63	23	20.05	0.79

63.25	2.49	U 1/2			63 1/4	23 1/4	20.13	0.79

63.50	2.50			10 1/2	63 1/2	23 1/2	20.21	0.8		20 1/4

63.75	2.51	V			63 3/4	23 3/4	20.29	0.8

64.00	2.52		64		64	24	20.37	0.8	23

64.25	2.53			10 3/4	64 1/4	24 1/4	20.45	0.81

64.50	2.54	V 1/2			64 1/2	24 1/2	20.53	0.81		20 1/2

64.75	2.55			11	64 3/4	24 3/4	20.61	0.81

65.00	2.56	W	65		65	25	20.69	0.81	24

65.25	2.57				65 1/4	25 1/4	20.77	0.82		20 3/4

65.50	2.58			11 1/4	65 1/2	25 1/2	20.85	0.82

65.75	2.59	W 1/2			65 3/4	25 3/4	20.93	0.82

66.00	2.60		66	11 1/2	66	26	21.01	0.83	25	21

66.25	2.61	X			66 1/4	26 1/4	21.09	0.83

66.50	2.62				66 1/2	26 1/2	21.17	0.83

66.75	2.63			11 3/4	66 3/4	26 3/4	21.25	0.84		21 1/4

67.00	2.64	X 1/2	67		67	27	21.33	0.84	26

67.25	2.65				67 1/4	27 1/4	21.41	0.84

67.50	2.66	Y		12	67 1/2	27 1/2	21.49	0.85		21 1/2

67.75	2.67				67 3/4	27 3/4	21.57	0.85

68.00	2.68		68	12 1/4	68	28	21.65	0.85	27

68.25	2.69	Y 1/2			68 1/4	28 1/4	21.72	0.86		21 3/4

68.50	2.70				68 1/2	28 1/2	21.8	0.86

68.75	2.71	Z		12 1/2	68 3/4	28 3/4	21.88	0.86

69.00	2.72		69		69	29	21.96	0.86	28	22

69.25	2.73			12 3/4	69 1/4	29 1/4	22.04	0.87

69.50	2.74	Z 1/2			69 1/2	29 1/2	22.12	0.87

69.75	2.75				69 3/4	29 3/4	22.2	0.87

70.00	2.76	Z+1	70	13	70	30	22.28	0.88		22 1/4

70.25	2.77				70 1/4	30 1/4	22.36	0.88	29

70.50	2.78				70 1/2	30 1/2	22.44	0.88

70.75	2.79	Z+1 1/2		13 1/4	70 3/4	30 3/4	22.52	0.89		22 1/2

© Royal Claddagh, 2001

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