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Here at Ralph Blacklock we can provide you with a reusable ring sizer that will last you forever. Alternatively you can use a piece of string to measure your finger the instructions are listed at the bottom of this page. We have also provided a ring size conversion table for various countries as sizes differ from country to country.
How to use a piece of string to measure your ring size.
1. Find a piece of string
2. Create a full circle by wrapping it around the correct finger
3. Use a pen to mark the point on the string where it overlaps
4. Use a ruler and measure the marked area in millimetres
5. Match the measurement to the circumference in the table
Tips
- Remember it is the inside of the string you are measuring
- If the measurement falls between, always go to the bigger size
- Measure the chosen finger at the end of the day (when warmest)
- Do not measure cold fingers
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| Ring Size Conversion Table |
| Britain |
Europe |
Japan |
USA |
Diameter |
Circumference |
| G |
4.92 |
5 |
|
14.30 |
44.92 |
| G1/2 |
5.55 |
|
31/2 |
14.50 |
45.55 |
| H |
6.18 |
6 |
33/4 |
14.70 |
46.18 |
| H1/2 |
6.81 |
|
4 |
14.90 |
46.81 |
| I |
7.44 |
7 |
41/4 |
15.10 |
47.44 |
| I1/2 |
8.07 |
8 |
41/2 |
15.30 |
48.07 |
| J |
8.69 |
|
43/4 |
15.50 |
48.69 |
| J1/2 |
9.32 |
9 |
5 |
15.70 |
49.32 |
| K |
9.95 |
|
51/4 |
15.90 |
49.95 |
| K1/2 |
10.58 |
10 |
51/2 |
16.10 |
50.58 |
| L |
11.24 |
11 |
53/4 |
16.31 |
51.24 |
| L1/2 |
11.87 |
12 |
6 |
16.51 |
51.87 |
| M |
12.46 |
|
61/4 |
16.70 |
52.46 |
| M1/2 |
13.09 |
|
61/2 |
16.90 |
53.09 |
| N |
13.72 |
13 |
63/4 |
17.10 |
53.72 |
| N1/2 |
14.35 |
14 |
7 |
17.30 |
54.35 |
| O |
14.98 |
|
71/4 |
17.50 |
54.98 |
| O1/2 |
15.61 |
15 |
71/2 |
17.70 |
55.61 |
| P |
16.23 |
|
73/4 |
17.90 |
56.23 |
| P1/2 |
16.86 |
16 |
8 |
18.10 |
56.86 |
| Q |
17.49 |
17 |
81/4 |
18.30 |
57.49 |
| Q1/2 |
18.12 |
|
|
18.50 |
58.12 |
| R |
183/4 |
18 |
81/2 |
18.70 |
583/4 |
* USA & Japan Sizes are set to the nearest UK Equivalent. |
