Hong Kong and China ring sizes
Hong Kong ring sizes follow about 12.05 mm plus 0.35 mm of diameter per size, so Hong Kong 15 is about 17.3 mm across and 54.4 mm round, the same as US 7. There is no official definition: this is a fit to jewellers’ charts.
No official definition was found. The sizes below follow a simple relation that reproduces the published charts named below within the error stated in the text; use the shop’s own chart when it gives one.
Where it is used: Hong Kong SAR China, China
Hong Kong and China size table
| Hong Kong and China size | Inside Ø mm | Circumference mm | Nearest US | Nearest UK | Nearest ISO |
|---|---|---|---|---|---|
| 6 | 14.2 | 44.5 | ≈ 3 | F½ | ≈ 44 |
| 7 | 14.5 | 45.6 | 3.5 | G½ | ≈ 46 |
| 8 | 14.9 | 46.7 | 4 | ≈ H½ | ≈ 47 |
| 9 | 15.2 | 47.8 | ≈ 4.5 | ≈ I | ≈ 48 |
| 10 | 15.5 | 48.9 | ≈ 4.75 | J | 49 |
| 11 | 15.9 | 50.0 | 5.25 | K | 50 |
| 12 | 16.3 | 51.1 | ≈ 5.75 | ≈ L | 51 |
| 13 | 16.6 | 52.2 | ≈ 6 | ≈ L½ | ≈ 52 |
| 14 | 17.0 | 53.2 | 6.5 | M½ | ≈ 53 |
| 15 | 17.3 | 54.3 | 7 | N½ | ≈ 54 |
| 16 | 17.7 | 55.4 | ≈ 7.5 | ≈ O½ | ≈ 55 |
| 17 | 18.0 | 56.5 | ≈ 7.75 | ≈ P | ≈ 57 |
| 18 | 18.4 | 57.6 | 8.25 | Q | ≈ 58 |
| 19 | 18.7 | 58.7 | 8.75 | R | ≈ 59 |
| 20 | 19.1 | 59.8 | ≈ 9.25 | ≈ S | ≈ 60 |
| 21 | 19.4 | 60.9 | ≈ 9.5 | ≈ T | 61 |
| 22 | 19.8 | 62.0 | 10 | ≈ T½ | 62 |
| 23 | 20.1 | 63.1 | ≈ 10.5 | U½ | 63 |
| 24 | 20.5 | 64.2 | ≈ 10.75 | V½ | ≈ 64 |
| 25 | 20.8 | 65.3 | 11.25 | ≈ W½ | ≈ 65 |
| 26 | 21.2 | 66.4 | 11.75 | ≈ X | ≈ 66 |
| 27 | 21.5 | 67.5 | ≈ 12.25 | Y | ≈ 68 |
| 28 | 21.9 | 68.6 | ≈ 12.5 | Z | ≈ 69 |
| 29 | 22.2 | 69.7 | 13 | ≈ Z+1 | ≈ 70 |
| 30 | 22.5 | 70.8 | ≈ 13.5 | ≈ Z+1½ | ≈ 71 |
| 31 | 22.9 | 71.9 | ≈ 13.75 | Z+2½ | 72 |
About Hong Kong and China sizes
Hong Kong and China ring sizes appear on jewellers’ charts in Hong Kong and mainland China. For example, US 7 corresponds to Hong Kong 15 in this table. These numbers help compare sizes, but the chart used can vary between shops.
There is no official Hong Kong definition, and no mainland standard or separate Chinese scale. Hong Kong charts follow inside diameter, while mainland shops may use the Hong Kong number or a different trade convention based on circumference. For the same finger, those readings can differ by up to two sizes, so treat the number as a shop-specific guide.
Use the table to compare this system with other size labels, then check the chart of the shop you plan to buy from. Measure the inside diameter of a ring that fits the intended finger, and compare it with that chart. Before buying, you can also use the RingSteps converter or printable sizer, then confirm the result with the seller’s own chart.
Sources
- Ring size chart (PDF), Hong Kong 5 to 30 (Chow Sang Sang) Checked November 10, 2026
- Ring size guide, Hong Kong 6 to 27 (Chow Tai Seng) Checked November 10, 2026