Ring size chart

Quick Guide to Define Your Ring Size

how-to-measure-ring-sinze

How to Find Your Ring Size

Get your size for your ring

If you don't care which finger you wear your ring on:

  • Get a size 9 or 10, that's the average size 90% of men buy.
  • The most commonly purchased women’s ring size at is size 7.

If you know your finger size or measurement (in mm), you can go directly to the  size chart. 

Measure your finger with a string:

  1. Wrap a piece of string around your finger. Be sure to take into account the size of your joint.
  2. Using a pen, mark the point where the two ends of the string meet.
  3. Using the chart below, match the distance in cm between the meeting point you marked with the pen and the end of your string and your ring size!
 Ring Size
(USA)
Measured Length
(inches)
Measured Length
(millimeters)
6
2 -3/16
52
7
2 - 5/16
55
8
2 - 7/16
58
9
2 - 9/16
61
10
2 - 9/16
65
11
 2 - 11/16 68
12
 2 - 13/16 71
13
 2 - 15/16 74
14
 3 - 1/16 77.7875


If you really can’t find out what another person’s ring size is, then it might be useful to know that the average ring size for a man is 9 to 10 and the average ring size for a woman is 6 to 7. If you have no other way of finding out someone’s ring size and you have to make a guess, it is better to go to the upper end of your estimate so that at least the ring will fit on the person’s finger when you surprise them with your gift, even if the ring has to be made slightly smaller later on.

 

Ring Size Chart
Inside Diameter
Inside Circumference
  
(in)
(mm)
(in)
(mm)
US Ring Size
British Ring Size
Japanese Ring
Size
Swiss Ring Size
0.458
11.63
1.44
36.5
0
      
0.466
11.84
1.46
37.2
¼
      
0.474
12.04
1.49
37.8
½
A
    
0.482
12.24
1.51
38.5
¾
A½
    
0.49
12.45
1.54
39.1
1
B
1
  
0.498
12.65
1.56
39.7
1¼
B½
    
0.506
12.85
1.59
40.4
1½
C
  
0.5
0.514
13.06
1.61
41
1¾
C½
  
1
0.522
13.26
1.64
41.7
2
D
2
1.75
0.53
13.46
1.67
42.3
2¼
D½
  
2.25
0.538
13.67
1.69
42.9
2½
E
3
3
0.546
13.87
1.72
43.6
2¾
E½
  
3.5
0.554
14.07
1.74
44.2
3
F
4
4.25
0.562
14.27
1.77
44.8
3¼
F½
5
4.75
0.57
14.48
1.79
45.5
3½
G
  
5.5
0.578
14.68
1.82
46.1
3¾
G½
6
6
0.586
14.88
1.84
46.8
4
H
7
6.75
0.594
15.09
1.87
47.4
4¼
H½
  
7.5
0.602
15.29
1.89
48
4½
I
8
8
0.61
15.49
1.92
48.7
4¾
J
  
8.75
0.618
15.7
1.94
49.3
5
J½
9
9.25
0.626
15.9
1.97
50
5¼
K
  
10
0.634
16.1
1.99
50.6
5½
K½
10
10.5
0.642
16.31
2.02
51.2
5¾
L
  
11.25
0.65
16.51
2.04
51.9
6
L½
11
11.75
0.658
16.71
2.07
52.5
6¼
M
12
12.5
0.666
16.92
2.09
53.1
6½
M½
13
13.25
0.674
17.12
2.12
53.8
6¾
N
  
13.75
0.682
17.32
2.14
54.4
7
N½
14
14.5
0.69
17.53
2.17
55.1
7¼
O
  
15
0.698
17.73
2.19
55.7
7½
O½
15
15.75
0.706
17.93
2.22
56.3
7¾
P
  
16.25
0.714
18.14
2.24
57
8
P½
16
17
0.722
18.34
2.27
57.6
8¼
Q
  
17.5
0.73
18.54
2.29
58.3
8½
Q½
17
18.25
0.738
18.75
2.32
58.9
8¾
R
  
19
0.746
18.95
2.34
59.5
9
R½
18
19.5
0.754
19.15
2.37
60.2
9¼
S
  
20.25
0.762
19.35
2.39
60.8
9½
S½
19
20.75
0.77
19.56
2.42
61.4
9¾
T
  
21.5
0.778
19.76
2.44
62.1
10
T½
20
22
0.786
19.96
2.47
62.7
10¼
U
21
22.75
0.794
20.17
2.49
63.4
10½
U½
22
23.25
0.802
20.37
2.52
64
10¾
V
  
24
0.81
20.57
2.54
64.6
11
V½
23
24.75
0.818
20.78
2.57
65.3
11¼
W
  
25.25
0.826
20.98
2.59
65.9
11½
W½
24
26
0.834
21.18
2.62
66.6
11¾
X
  
26.5
0.842
21.39
2.65
67.2
12
X½
25
27.25
0.85
21.59
2.67
67.8
12¼
Y
  
27.75
0.858
21.79
2.7
68.5
12½
Z
26
28.5
0.866
22
2.72
69.1
12¾
Z½
  
29
0.874
22.2
2.75
69.7
13
  
27
29.75
0.882
22.4
2.77
70.4
13¼
Z1
  
30.5
0.89
22.61
2.8
71
13½
  
28
31
0.898
22.81
2.82
71.7
13¾
Z2
  
31.75
0.906
23.01
2.85
72.3
14
Z3
29
32.25
0.914
23.22
2.87
72.9
14¼
    
33
0.922
23.42
2.9
73.6
14½
Z4
30
33.5
0.93
23.62
2.92
74.2
14¾
    
34.25
0.938
23.83
2.95
74.8
15
  
31
34.75
0.946
24.03
2.97
75.5
15¼
    
35.5
0.954
24.23
3
76.1
15½
  
32
36.25
0.962
24.43
3.02
76.8
15¾
    
36.75
0.97
24.64
3.05
77.4
16
  
33
37.5
       

 

If you are going into a jewelry store to buy a ring, then the store assistant will have a ring size tool, which is simply a series of metal rings into which you can slip your finger in to find out the ring size that you need. However, if you are buying rings online and you don’t know what size your fingers are, how do you work out what ring size will fit you? Use our handy guide below on how to find your US ring size at home.

What time of day do you measure your ring size?

Your fingers change size through the course of the day, because they can be affected by the temperature. If it’s very cold your ring size will be smaller than usual, and if it’s very hot, your ring size will be larger. In fact, your ring size can fluctuate by as much as half a size through the course of a day. The best time to measure your ring size is in the evening, because that is when the temperature will be nearer to the average.

Which finger do you measure?

Always measure the actual finger that the ring that you are buying is for. You can’t measure the same finger on the opposite hand, because the fingers of your dominant hand are quite likely to be around half a size bigger than the fingers of your non-dominant hand.

What type of rings are you buying?

The types of rings that you are buying can affect how you measure your ring size, as can the positioning of the ring on your finger. If you are buying a wide band ring, you might want to consider a ring size half a size bigger than your actual ring size to make wearing the ring more comfortable. You should also measure your ring size on the part of your finger that you are going to wear the ring.

How to measure your finger at home

To be able to work out your ring size you will need to measure the circumference or diameter of your finger. You can buy your own ring size tool if you like, but as most of us don’t buy rings all that often, that’s probably an unnecessary expense.

To measure your finger, simply take a piece of paper or a length of string and wrap it around your finger, making sure that it isn’t too tight. Then mark the point on the string or paper where it meets to form a circle, and then you can measure the length of the paper or string to find the circumference of your finger.

How to calculate your US ring size

Once you know the circumference of your finger, working out what your ring size is very straightforward. Simply locate the circumference of your finger, in either millimeters of inches, on the chart that we have provided below, and then you will able to look up your US ring size.

Different countries use different ring sizes.

You need to be aware that if you buy a ring from an overseas website, you will have to look up the local ring sizes, because different countries use different standards of ring sizes. The US ring sizes are only used in the US and Canada. The UK, Australia and Ireland use a system of letters to denote ring size, India, Japan and China use a different numbering system from the US, and other countries use ISO standard ring sizes. We have included the British, Japanese and Swiss ring sizes in our ring size chart below.

How to find someone else’s ring size and keep it a surprise

If you are aiming to surprise someone with a ring, finding the right ring size for them is going to be a bit trickier. You could try to borrow a ring that the person already owns and take the ring size from the diameter of that, but you will need to make sure that it is a ring that the person wears on the same finger that they will wear the ring that you are buying them. Alternatively, you could ask someone who might know, like the person’s parents or friends.

If you are really can’t find out what another other person’s ring size is then it might be useful to know that the average ring size for a man is 9 to 10 and the average ring size for a woman is 6 to 6.5. If you have no other way so finding out someone’s ring size and you have to make a guess, it is better to go to the upper end of your estimate so that at least the ring will fit on the person’s finger when you surprise them with your gift, even if the ring has to be made slightly smaller later on.