ring sizing information:  
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Please check your ring size against the metric column in the table below.
The ring sizes offered in the drop down boxes are in half millimetre increments.

e.g. "I am a size a Uk size "N" (French 52 3/4, German 16 1/2, Japanese 13, Swiss 14 & US size 6 1/2), so that would make 52.8mm, which means I would choose 53 from the drop down box as my size.

Is that right?

Yes, mostly: but please read on if the ring you have in mind has a wide shank.

The table below is just a guide. There are a number of other factors to also take into account, such as how you as an individual like to wear your rings, the ambient temperature when any measuring was done, (one's ring size can alter dependent on how hot and humid the environment is etc).
The real consideration that can catch people out when ordering a ring. Is that the size you choose is also affected by how wide the ring is.

I make quite a few wider rings and to get the same "feel" as "standard" width rings you may normally wear, one usually has to have at least one full size bigger.

If you are unsure, the best thing to do is ask a friendly jeweller to measure your finger, with something close to the width of ring you are wanting. Or you can arrange to send an example of your size, which will be returned along with your order.

Check out this post for some tips for getting the right size.

downloadable ring sizer (us sizes)

Dia. in MM
Metric mm
British 
French 
German 
Japanese 
Swiss 
US  Size
9.91
           
0000
10.72
           
00
11.53
           
0
11.95
 
A
       
1/2
12.18
 
A 1/2
       
3/4
12.37
38.9
B
   
1
 
1
12.60
39.6
B 1/2
       
1 1/4
12.78
40.2
C
       
1 1/2
13.00
40.8
C 1/2
       
1 3/4
13.21
41.5
D
41 1/2
13 1/2
2
1 1/2
2
13.41
42.1
D 1/2
 
   
2 1/4
13.61
42.7
E
42 3/4
13 3/4
3
2 3/4
2 1/2
13.83
43.4
E 1/2
 
   
2 3/4
14.05
44.0
F
44
14
4
4
3
14.15
44.3
F 1/2
 
   
3 1/8
14.25
44.6
 
3 1/4
14.36
44.9
G
45 1/4
5
5 1/4
3 3/8
14.45
45.2
 
14 1/2
   
3 1/2
14.56
45.6
 G 1/2
   
6
 
3 5/8
14.65
45.9
H
46 1/2
   
6 1/2
3 3/4
14.86
46.5
H 1/2
 
15
7
 
4
15.04
47.1
47 3/4
   
7 3/4
4 1/4
15.27
47.8
I 1/2
 
15 1/4
8
 
4 1/2
15.40
48.1
J
49
15 1/2
 
9
4 5/8
15.53
48.4
British 
French 
German 
Japanese 
Swiss 
4 3/4
15.70
49.0
J 1/2
 
15 3/4
9
 
5
15.80
49.3
K
50
   
10
5 1/8
15.90
49.6
     
5 1/4
16.0
50.0
K 1/2
 
10
 
5 3/8
16.10
50.3
L
51 3/4
16
 
11 3/4
5 1/2
16.30
50.9
     
5 3/4
16.41
51.3
L 1/2
     
5 7/8
16.51
51.5
M
52 3/4
16 1/2
12
12 3/4
6
16.71
52.2
M 1/2
     
6 1/4
16.92
52.8
N
54
17
13
14
6 1/2
17.13
53.4
N 1/2
     
6 3/4
17.35
54.0
O
55 1/4
17 1/4
14
15 1/4
7
17.45
54.7
O 1/2
     
7 1/4
17.75
55.3
P
56 1/2
17 3/4
15
16 1/2
7 1/2
17.97
55.9
P 1/2
     
7 3/4
18.19
56.6
Q
57 3/4
18
16
17 3/4
8
18.35
57.2
Q 1/2
     
8 1/4
18.53
57.8
18 1/2
17
 
8 1/2
18.61
58.4
R
59
   
19
8 5/8
18.69
58.4
     
8 3/4
18.80
59.0
R 1/2
     
8 7/8
18.89
59.1
19
18
 
9
19.10
59.4
S
60 1/4
   
20 1/4
9 1/8
19.22
59.7
     
9 1/4
19.31
60.0
S 1/2
     
9 3/8
19.41
60.3
 
19 1/2
19
 
9 1/2
19.51
60.6
T
61 1/2
   
21 1/2
9 5/8
19.62
60.9
British 
French 
German 
Japanese 
Swiss 
9 3/4
19.84
61.6
T 1/2
20
20
 
10
20.02
62.2
U
62 3/4
 
21
22 3/4
10 1/4
20.20
62.8
U 1/2
20 1/4
22
 
10 1/2
20.32
63.1
V
63
   
23 3/4
10 5/8
20.44
63.5
     
10 3/4
20.68
64.1
V 1/2
20 3/4
23
 
11
20.76
64.3
W
65
   
25
11 1/8
20.85
64.7
       
11 1/4
20.94
65.0
W 1/2
       
11 3/8
21.08
65.3
 
21
24
 
11 1/2
21.18
65.7
X
66 1/4
   
26 1/4
11 5/8
21.24
66.0
       
11 3/4
21.30
66.3
X 1/2
       
11 7/8
21.49
66.6
Y
67 1/2
21 1/4
25
27 1/2
12
21.69
67.2
Y 1/2
     
12 1/4
21.89
67.9
Z
68 3/4
21 3/4
26
28 3/4
12 1/2
22.10
68.5
Z 1/2
     
12 3/4
22.33
69.1
22
27
 
13
Dia. in MM
Metric mm
British 
French 
German 
Japanese 
Swiss 
US  Size