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

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 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 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 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    
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    
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    
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    
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      

Diamond Ring by Stephen Walker

Original designs inspired by the heritage
of Ireland, Scotland and Wales.

St Andrew Knot Ring

When sizing make note that wider rings
fit differently so you may need a larger size
depending on the width of the ring

Claddagh  Wedding Rings

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

 

For Larger size equivalents click here

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.

 

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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.

Copyright, Walker Metalsmiths, 2002  Updated 2013