Written By Alex Wong.
Last updated: 29 Oct 2026.
Ring Size Chart
Finding a ring size that fits your finger comfortably is a crucial step once you have chosen your ring design. Below, we provide a ring size conversion table and 3 ways to measure ring size discreetly.
Note: Rings not illustrated to scale.
Ring Size Conversion Table
| Inter-Diameter (mm) | HK Size | US Size | UK Size | JP Size | CH Size |
|---|---|---|---|---|---|
| 14.1 | 6 | 3 | F | 4 | 4 |
| 14.3 | 7 | 3.25 | F 1/2 | 5 | 5.25 |
| 14.7 | 8 | 3.75 | G | 6 | 6.5 |
| 14.9 | 9 | 4 | H | 7 | 7 |
| 15.3 | 10 | 4.5 | I | 8 | 8.5 |
| 15.7 | 11 | 5 | J 1/2 | 9 | 9.5 |
| 16.1 | 12 | 5.5 | K 1/2 | 10 | 10.5 |
| 16.5 | 13 | 6 | L 1/2 | 11 | 12.75 |
| 16.7 | 14 | 6.25 | M | 12 | 13.5 |
| 17.1 | 15 | 6.75 | N | 13.5 | 14.5 |
| 17.3 | 16 | 7 | N 1/2 | 14 | 15.25 |
| 17.7 | 17 | 7.5 | O 1/2 | 15 | 16.5 |
| 18.2 | 18 | 8 | P 1/2 | 16.25 | 18.25 |
| 18.5 | 19 | 8.5 | Q 1/2 | 17 | 18.75 |
| 18.8 | 20 | 9.75 | R | 17.5 | 19 |
| 19.1 | 21 | 9.25 | S | 18 | 20 |
| 19.4 | 22 | 9.5 | S 1/2 | 19 | 20.75 |
| 19.8 | 23 | 10 | T 1/2 | 20 | 21.75 |
| 20.2 | 24 | 10.5 | U 1/2 | 22 | 22.75 |
| 20.6 | 25 | 11 | V 1/2 | 23 | 24.75 |
| 21.0 | 26 | 11.5 | W 1/2 | 24 | 26.25 |
| 21.2 | 27 | 12 | X | 24.5 | 26.75 |
| 21.6 | 28 | 12.25 | Y | 25.5 | 28 |
| 22.0 | 29 | 12.5 | Z 1/2 | 26.5 | 29 |
How to Measure a Ring in Secret
Purchasing an engagement ring or a surprise present for your significant other? Below are our top recommendations for discreetly determining their ring size.
Ask a Friend / Family Member
Someone familiar with your partner may already be aware of their ring size or could delicately inquire on your behalf.
Measure an Existing Ring
You may measure an existing ring that someone already has. Either visit a jeweller for measurement or use a printable ring size guide to measure it yourself.
Measure Their Finger While They Are Asleep
While a bit more challenging, you can measure your partner's finger using a length of string while they are asleep. Simply wrap the string around their ring finger and tie a knot. Then, using the string, compare its length to our ring size guide.
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When scheduling your visit, please share your preferences and budget with us. We are dedicated to providing
tailored recommendations and are eager to assist you in selecting the ideal
gift.
