Ring Size Conversion Chart

Use the chart below for conversion of US and Canadian number sizes to the "Wheat sheaf" system of letter sizes used in Ireland, U.K. Australia, ect. Diameters and circumferences are also given in both inches and millimeters. Please note that these measurements are exact for the American system and approximate for the other sizing scales, since the intervals in each system do not correspond exactly.

Ring sizing gauges and finger gauges as well as published charts do not always agree. Add to this that there are two conflicting methods of reading ring gauges so it is quite common for ring sizes to vary slightly from one workshop or jeweler to another. The ring sizing information presented here is the result of a conscientious study and comparison of various sources and is consistent with the instruments and measuring technique that we use in our workshop.

Celtic Ring designs by Walker Metalsmiths

Available in Silver, Gold and Platinum

Inside	Inside	Inside	Inside	Number Sizes	Wheat Sheaf
Diameter	Diameter	Circumference	Circumference	US/Canada	British	Japanese	Swiss
(inches)	(mm)	(inches)	(mm)	Standard	Irish	Equivalent	Equivalent
					Australian
					Equivalent
0.458	11.6	1.438	36.5	0
0.466	11.8	1.463	37.2	1/4
0.474	12.0	1.488	37.8	1/2	A
0.482	12.2	1.513	38.4	3/4	A 1/2
0.490	12.4	1.539	39.1	1	B	1
0.498	12.6	1.564	39.7	1 1/4	B 1/2
0.506	12.9	1.589	40.4	1 1/2	C
0.514	13.1	1.614	41.0	1 3/4	C 1/2
0.522	13.3	1.639	41.6	2	D	2	1.50
0.530	13.5	1.664	42.3	2 1/4	D 1/2
0.538	13.7	1.689	42.9	2 1/2	E	3	2.75
0.546	13.9	1.714	43.5	2 3/4	E 1/2
0.554	14.1	1.740	44.2	3	F	4	4.00
0.562	14.3	1.765	44.8	3 1/4	F 1/2	5	5.25
0.570	14.5	1.790	45.5	3 1/2	G
0.578	14.7	1.815	46.1	3 3/4	G 1/2	6	6.50
0.586	14.9	1.840	46.7	4	H	7
0.594	15.1	1.865	47.4	4 1/4	H 1/2		7.75
0.602	15.3	1.890	48.0	4 1/2	I	8
0.610	15.5	1.915	48.7	4 3/4	J		9.00
0.618	15.7	1.941	49.3	5	J 1/2	9
0.626	15.9	1.966	49.9	5 1/4	K		10.00
0.634	16.1	1.991	50.6	5 1/2	K 1/2	10
0.642	16.3	2.016	51.2	5 3/4	L		11.75
0.650	16.5	2.041	51.8	6	L 1/2	11	12.75
0.658	16.7	2.066	52.5	6 1/4	M	12
0.666	16.9	2.091	53.1	6 1/2	M 1/2	13	14.00
0.674	17.1	2.116	53.8	6 3/4	N
0.682	17.3	2.141	54.4	7	N 1/2	14	15.25
0.690	17.5	2.167	55.0	7 1/4	O
0.698	17.7	2.192	55.7	7 1/2	O 1/2	15	16.50
0.706	17.9	2.217	56.3	7 3/4	P
0.714	18.1	2.242	56.9	8	P 1/2	16	17.75
0.722	18.3	2.267	57.6	8 1/4	Q
0.730	18.5	2.292	58.2	8 1/2	Q 1/2	17
0.738	18.7	2.317	58.9	8 3/4	R		19
0.746	18.9	2.342	59.5	9	R 1/2	18
0.754	19.2	2.368	60.1	9 1/4	S		20.25
0.762	19.4	2.393	60.8	9 1/2	S 1/2	19
0.770	19.6	2.418	61.4	9 3/4	T		21.5
0.778	19.8	2.443	62.1	10	T 1/2	20
0.786	20.0	2.468	62.7	10 1/4	U	21
0.794	20.2	2.493	63.3	10 1/2	U 1/2	22	22.75
0.802	20.4	2.518	64.0	10 3/4	V
0.810	20.6	2.543	64.6	11	V 1/2	23
0.818	20.8	2.569	65.2	11 1/4	W		25
0.826	21.0	2.594	65.9	11 1/2	W 1/2	24
0.834	21.2	2.619	66.5	11 3/4	X
0.842	21.4	2.644	67.2	12	X 1/2	25	27.50
0.850	21.6	2.669	67.8	12 1/4	Y
0.858	21.8	2.694	68.4	12 1/2	Z	26	28.75
0.866	22.0	2.719	69.1	12 3/4	Z 1/2
0.874	22.2	2.744	69.7	13		27
0.882	22.4	2.769	70.3	13 1/4	Z1
0.890	22.6	2.795	71.0	13 1/2
0.898	22.8	2.820	71.6	13 3/4	Z2
0.906	23.0	2.845	72.3	14	Z3
0.914	23.2	2.870	72.9	14 1/4
0.922	23.4	2.895	73.5	14 1/2	Z4
0.930	23.6	2.920	74.2	14 3/4
0.938	23.8	2.945	74.8	15
0.946	24.0	2.970	75.4	15 1/4
0.954	24.2	2.996	76.1	15 1/2
0.962	24.4	3.021	76.7	15 3/4
0.970	24.6	3.046	77.4	16

We can measure rings with a great deal more accuracy than we can measure fingers. That is why we call it a ring size rather than a finger size.

Jeweler's finger gauge rings

Narrow rings are the most common, but if you are buying a wider ring it is best to try a wider set like the one's shown on the left, or anticipate that you will need a quarter or half size larger if the finger is sized using narrow sizing rings.

The dash marks following every other number on the rings indicate half sizes
7- = 7 1/2

Reality Check

Rings and gauges are hard metal objects that can be measured exactly, but your finger is flesh and bone. Your finger is not round and it cannot be measured with the same degree of accuracy as the ring. At the end of the day, the right ring is one that will stay on comfortably. Average ring finger sizes may be useful as a point of reference for people who are not very good at measurements. These are offered to help you know if your calculations are reasonable.

Average adult women size 6 to 8 or L to Q
Most American jewelers
get women's samples in size 7
Average adult man size 9 to 11 or J to W
Most American jewelers
get men's samples in size 10

Finger sizes sometimes do not correspond to body size. Finger sizes also are prone to change with temperature, humidity, exercise, what you have been eating, time of day, time of the month, pregnancy and other factors. Dominant hand is usually 1/2 size larger, so if you are right handed and have a size 7 ring that fits the left hand it is reasonable to guess that a 7 1/2 will fit the right hand. Quarter sizes are offered to help you get the best fit, however quarter sizes make more difference on smaller fingers than on large fingers.

The best size is usually the ring that fits snugly and gives a little resistance when you take it off. Wider rings should be a little looser that narrow rings.
Men take note that if you are not used to wearing a ring, the proper size will probably feel tight a first. Many men loose their wedding rings because they choose sizes that are too loose.

There are two common methods of reading a ring gauge,
also called a sizing mandrel or sizing stick.

This ring is a 10 1/2 if sized by the true diameter method
or
10 1/4 if sized by the center line method.

At Walker Metalsmiths we would call this ring
size 10 1/2

True diameter method
This is the method we use at Walker Metalsmiths.
The mark is read at the point at which the wider side of the taper meets the edge of the ring. Wide rings are occasionally tapered and the smaller of the edges of the ring should be taken as the true size since this is the diameter of the largest finger that can fit into it.

The center line method
Using this method the mark at the center of the ring is judged to be the size. Using this method a wider ring will be measured at a size slightly smaller than it's true diameter, due to the taper of the sizing gauge. This method automatically compensates somewhat for the fact that on the same finger a wider ring will fit tighter.

If the ring is narrow, 3mm or less, the difference between the two methods is negligible. Wider rings gauged by these two methods will be called a slightly smaller size if the center line method is used. Because a ring size is a definition of diameter we think that it is proper that a ring actually measures the true diameter rather than contain a fudge factor for width. Your local jeweler may disagree, but calibration of gauges from different manufacturers may also disagree.

Every effort has been made to make the information on this page as accurate as possible. Walker Metalsmiths disclaims any responsibility for errors in this information except for transactions that are sales or purchases made by Walker Metalsmiths. Our free ring sizing policy is from 90 days of purchase with the restriction that gold or platinum rings may involve a price adjustment if an exchange is made that crosses a price bracket.