Found the perfect diamond ring but unsure of your ring size? Whether you’re choosing an engagement ring for your partner or a wedding band for yourself, our international ring size guide offers the most reliable tips on how to measure your ring size at home.
International Ring Size Guide
Inside Diameter (mm) | Inside Circumference (mm) | UK / AU Size | US / Canada Size | Europe Size |
|---|---|---|---|---|
14.0 | 44.0 | F | 3 | 44 |
14.2 | 44.7 | F ½ | 3.25 | 44.7 |
14.4 | 45.2 | G | 3.5 | 45.2 |
14.6 | 45.9 | G ½ | 3.75 | 45.9 |
14.8 | 46.5 | H | 4 | 46.5 |
15 | 47.1 | H ½ | 4.25 | 47.1 |
15.2 | 47.8 | I | 4.5 | 47.8 |
15.4 | 48.4 | I ½ | 4.75 | 48.4 |
15.6 | 49.0 | J | 5 | 49 |
15.8 | 49.6 | J ½ | 5.25 | 49.6 |
16 | 50.3 | K | 5.5 | 50.3 |
16.2 | 50.9 | K ½ | 5.75 | 50.9 |
16.4 | 51.5 | L | 6 | 51.5 |
16.6 | 52.2 | L ½ | 6.25 | 52.2 |
16.8 | 52.8 | M | 6.5 | 52.8 |
17.0 | 53.4 | M ½ | 6.75 | 53.4 |
17.2 | 54.0 | N | 7 | 54 |
17.4 | 54.6 | N ½ | 7.25 | 54.6 |
17.6 | 55.3 | O | 7.5 | 55.3 |
17.8 | 55.9 | O ½ | 7.75 | 55.9 |
18.0 | 56.6 | P | 8 | 56.6 |
18.2 | 57.2 | P ½ | 8.25 | 57.2 |
18.4 | 57.8 | Q | 8.5 | 57.8 |
18.6 | 58.4 | Q ½ | 8.75 | 58.4 |
18.8 | 59.1 | R | 9 | 59.1 |
19.0 | 59.7 | R ½ | 9.25 | 59.7 |
19.2 | 60.3 | S | 9.5 | 60.3 |
19.4 | 61.0 | S ½ | 9.75 | 61 |
19.6 | 61.6 | T | 10 | 61.6 |
19.8 | 62.2 | T ½ | 10.25 | 62.2 |
20.0 | 62.8 | U | 10.5 | 62.8 |
20.2 | 63.5 | U ½ | 10.75 | 63.5 |
20.4 | 64.1 | V | 11 | 64.1 |
20.6 | 64.7 | V ½ | 11.25 | 64.7 |
20.8 | 65.3 | W | 11.5 | 65.3 |
21.0 | 66.0 | W ½ | 11.75 | 66 |
21.2 | 66.6 | X | 12 | 66.6 |
21.4 | 67.2 | X ½ | 12.25 | 67.2 |
21.6 | 67.8 | Y | 12.5 | 67.8 |
21.8 | 68.5 | Y ½ | 12.75 | 68.5 |
22.0 | 69.1 | Z | 13 | 69.1 |
22.2 | 69.7 | Z ½ | 13.25 | 69.7 |
Please note that the table above is for recommendation purposes only
Ring Size Measuring Tips
To determine your ring size, we strongly advise that you measure the size of your finger rather than the size of another ring.
- Using a length of string or ribbon, wrap it around the base of your finger. To ensure the ring fits comfortably, we suggest measuring your knuckle as well.
- With a pen, mark the point on the string where the end meets.
- Measure the string in millimetres (recommended) or inches with a ruler.
- Use size chart above. Refer to the size you found in the 2nd column (named “Inside Circumference (mm)”) and match it to your relevant geographical location.
Additional Measuring Tips
- Measure your finger at the end of the day.
- Do not measure your finger when it is hot or cold.
- Remember that the two hands differ slightly in size.
- Make sure that the chosen size leaves enough room for the ring to pass easily along the entire length of the finger.