Conversions are approximate and should be taken as a guide only.
1. Wrap a piece of thin string or a strip of paper around your finger.
2. Mark the point where the two ends meet.
3. Measure the string or paper against a ruler to get the circumference of your finger.
4. Divide that by 3.14 to get the diameter of your finger.
5. Look up your ring size using the form below.
6. Remember, your knuckles are a little larger than your finger size and are also not a perfect circle.
7. Note, your finger changes size a little throughout the day, throughout the month and throughout the year.
There is no real substitute to having your finger measured at a jewellers.
UK Sizes		Inside	Diameter		Inside	Circum- ference		US Equivalent	European Equivalent	Japenese Equivalent
		Inches	mm's		Inches	mm's
A		0.45	11.5		1.42	36.1		0.0	-3.9	-3.5
A+1/2
B		0.48	12.3		1.52	38.6		0.9	-1.4	-1.1
B+1/2
C		0.50	12.7		1.57	39.9		1.4	-0.1	0.1
C+1/2
D		0.52	13.1		1.62	41.1		1.9	1.1	1.3
D+1/2
E		0.53	13.5		1.67	42.4		2.4	2.4	2.5
E+1/2
F		0.55	13.9		1.72	43.6		2.8	3.6	3.7
F+1/2
G		0.56	14.3		1.77	44.9		3.3	4.9	4.9
G+1/2
H		0.58	14.7		1.82	46.2		3.8	6.2	6.1
H+1/2
I		0.59	15.1		1.87	47.4		4.3	7.4	7.3
I+1/2
J		0.61	15.5		1.92	48.7		4.8	8.7	8.5
J+1/2
K		0.63	15.9		1.97	49.9		5.3	9.9	9.7
K+1/2
L		0.64	16.3		2.02	51.2		5.7	11.2	10.9
L+1/3
M		0.66	16.7		2.06	52.4		6.2	12.4	12.1
M+1/2
N		0.67	17.1		2.11	53.7		6.7	13.7	13.3
N+1/2
O		0.69	17.5		2.16	55.0		7.2	15.0	14.5
O+1/2
P		0.70	17.9		2.21	56.2		7.7	16.2	15.7
P+1/2
Q		0.72	18.3		2.26	57.5		8.1	17.5	16.9
Q+1/2
R		0.74	18.7		2.31	58.7		8.6	18.7	18.1
R+1/2
S		0.75	19.1		2.36	60.0		9.1	20.0	19.3
S+1/2
T		0.77	19.5		2.41	61.2		9.6	21.2	20.5
T+1/2
U		0.78	19.9		2.46	62.5		10.1	22.5	21.7
U+1/2
V		0.80	20.3		2.51	63.7		10.6	23.7	22.9
V+1/2
W		0.81	20.7		2.56	65.0		11.0	25.0	24.1
W+1/2
X		0.83	21.1		2.61	66.3		11.5	26.3	25.3
X+1/2
Y		0.85	21.5		2.66	67.5		12.0	27.5	26.5
Y+1/2
Z		0.86	21.9		2.71	68.8		12.5	28.8	27.7
Z+1/2		0.87	22.1		2.73	69.4		12.7	29.4	28.3
Z+1		0.88	22.3		2.76	70.0		13.0	30.0	28.9
Z+2		0.89	22.7		2.81	71.3		13.4	31.3	30.1
Z+3		0.91	23.1		2.86	72.5		13.9	32.5	31.3
Z+4		0.93	23.5		2.91	73.8		14.4	33.8	32.5
Z+5		0.94	23.9		2.95	75.0		14.9	35.0	33.7
Z+6		0.96	24.3		3.00	76.3		15.4	36.3	34.9
Z+7		0.97	24.7		3.05	77.6		15.9	37.6	36.1
Z+8		0.99	25.1		3.10	78.8		16.3	38.8	37.3