Want to know what the Hong Kong ring size is equivalent to in US, UK, European, Japanese, or mainland Chinese sizes? The following ring size comparison table organizes inner circumference, inner diameter, Hong Kong size, US size, UK size, European size, Japanese size, and mainland Chinese size, This helps you quickly find the right size before purchasing a ring, engagement ring, or custom jewelry.
WILLS JEWELLERY uses the Hong Kong ring size system. If the size is between two sizes, it is recommended to try it on in person or confirm with a jewelry consultant.
Quick ring size checker
Enter the ring inner diameter or inner circumference to quickly find the closest Hong Kong and international ring sizes. Please measure in millimeters and only measure the inner circle of the ring, excluding the metal border.
Tip: If both diameter and circumference are entered, the system will use the last modified item as the query basis.
Hong Kong ring size and international ring size conversion table
The following table can be used as a reference for converting ring sizes in Hong Kong, the United States, the United Kingdom, Europe, Japan, and mainland China. Different brands or styles of rings may vary slightly, and the actual wearing experience will also be affected by band width, finger shape, and weather.
European sizes are generally based on the inner circumference of the ring in millimeters, so they will be close to the "inner circumference"; the European sizes in the table are represented as the nearest whole number.
When browsing on a mobile phone, you can swipe left and right to view the complete size comparison chart.
| Inner circumference (mm) |
Inner diameter (mm) |
Hong Kong size | Mainland China Size |
European size | United States / Canada Size |
British size | Japanese size |
|---|---|---|---|---|---|---|---|
| 43.3 | 13.8 | 5 | 3 | 43 | 2.75 | E 1/2 | 3 |
| 44.3 | 14.1 | 6 | 4 | 44 | 3 | F 1/2 | 4 |
| 45.5 | 14.5 | 7 | 5.5 | 46 | 3.5 | H | 5 |
| 46.5 | 14.8 | 8 | 6.5 | 47 | 3.75 | H 1/2 | 6 |
| 47.7 | 15.2 | 9 | 8 | 48 | 4.25 | I 1/2 | 7 |
| 48.7 | 15.5 | 10 | 9 | 49 | 4.75 | J 1/2 | 8 |
| 49.9 | 15.9 | 11 | 10 | 50 | 5.25 | K | 9 |
| 50.9 | 16.2 | 12 | 11 | 51 | 5.5 | L | 10 |
| 52.1 | 16.6 | 13 | 12 | 52 | 6 | L 1/2 | 11 |
| 53.1 | 16.9 | 14 | 13 | 53 | 6.5 | M 1/2 | 12 |
| 54.3 | 17.3 | 15 | 14 | 54 | 7 | N 1/2 | 13.5 |
| 55.6 | 17.7 | 16 | 15.5 | 56 | 7.5 | P | 14.5 |
| 56.5 | 18.0 | 17 | 16.5 | 57 | 7.75 | P 1/2 | 15.5 |
| 57.5 | 18.3 | 18 | 17.5 | 58 | 8.25 | Q 1/2 | 16.5 |
| 58.7 | 18.7 | 19 | 19 | 59 | 8.75 | R | 17.5 |
| 59.7 | 19.0 | 20 | 20 | 60 | 9 | S | 18.5 |
| 60.9 | 19.4 | 21 | 21 | 61 | 9.5 | S 1/2 | 19.5 |
| 61.9 | 19.7 | 22 | 22 | 62 | 10 | T 1/2 | 20.5 |
| 63.1 | 20.1 | 23 | 23 | 63 | 10.25 | U 1/2 | 22 |
| 64.1 | 20.4 | 24 | 24 | 64 | 10.75 | V | 23 |
| 65.3 | 20.8 | 25 | 25 | 65 | 11.25 | W | 24 |
| 66.3 | 21.1 | 26 | 26 | 66 | 11.5 | W 1/2 | 25 |
| 67.5 | 21.5 | 27 | 27.5 | 68 | 12 | Z | 26 |
| 68.5 | 21.8 | 28 | 28.5 | 69 | 12.5 | Z 1/2 | 27 |
| 69.7 | 22.2 | 29 | 30 | 70 | 12.75 | Z+1 | 28 |
| 70.7 | 22.5 | 30 | 31 | 71 | 13.25 | Z+2 | 31 |
How to measure ring size?
The most accurate method is to measure the inner diameter or inner circumference of a ring that you wear comfortably on a daily basis, Then refer to the size chart above to find the corresponding Hong Kong size. Please measure in millimeters and avoid including the metal border of the ring.
1. Measure an existing ring
Choose a comfortable ring to wear and measure the diameter at the widest point of the inner circle with a caliper.
2. Measure the inner circumference
If using a strip of paper or a soft tape measure around your finger, measure the length that fits snugly around your finger and record it in millimeters.
3. Compare size chart
Compare the measured millimeter value with the ring sizes in Hong Kong, the United States, the United Kingdom, Europe, Japan, and mainland China.
Tip: Finger size can be affected by weather, time, swelling, and ring width. Generally, wider bands or thicker rings may require a slightly looser size.
What is the difference between the inner diameter and the inner circumference?
The inner diameter refers to the distance at the widest point of the ring's inner circle; the inner circumference is the length of the ring's inner circle. European ring sizes are usually based on the inner circumference in millimeters, so if you know the inner circumference, it will be easier to compare to European sizes.
If you only know the diameter, you can also use the quick search tool above to find the closest size. Due to slight variations in actual rings caused by band thickness, ring curvature, and measuring tools, It is recommended to use the try-on results as the final guideline.
What to do if you don't know the size for the engagement ring?
If you are preparing for a proposal but are unsure of the other person's ring size, you can try measuring the inner diameter of a ring that they usually wear on their ring finger or a nearby finger, or measure the inner circumference of the ring and refer to the size chart above. Since the sizes of the left and right hands may differ slightly, it is recommended to have the measurement results assessed by a jewelry consultant.
WILLS JEWELLERY can assist customers in determining the most suitable ring size based on the ring style, band width, gemstone design, and wearing habits, Reduce the chances of the engagement ring not fitting.
Can ring sizes be modified?
Some ring styles can be resized, but whether it is suitable for modification depends on the ring design, setting method, gemstone position, and metal structure. Rings with full diamond settings, intricate patterns, or special band designs usually have limited resizing options.
If you have questions about the size, it is recommended to confirm with a jewelry consultant before customizing or purchasing to ensure the ring fits comfortably while maintaining the original design proportions.
Need help confirming the ring size?
You can make an appointment at the WILLS JEWELLERY Central store, where a jewelry consultant will assist in measuring the ring size, And provide professional advice based on the ring style, band width, and wearing habits.
Common Questions About Ring Sizes
How to convert Hong Kong ring sizes to US sizes?
Hong Kong ring sizes can be converted to US sizes based on the inner diameter or inner circumference of the ring. For example, Hong Kong size 13 is approximately equal to US size 6, and Hong Kong size 16 is approximately equal to US size 7.5. The actual size is still recommended to be based on trying on or professional measurement.
Is the European ring size equal to the inner circumference?
Generally, European ring sizes are based on the inner circumference in millimeters; for example, an inner circumference of about 52 mm is usually close to European size 52. Conversion charts from different brands may have slight differences.
How to measure the inner diameter of a ring?
You can choose a comfortable ring that you usually wear and measure the diameter at the widest part of the inner circle with a caliper. When measuring, only calculate the inner space, excluding the metal border.
How to measure the inner circumference of a ring?
You can use a strip of paper or a soft tape measure to wrap around the base of the finger, noting the snug but not tight position, and then measure the length in millimeters. When measuring, avoid having fingers too cold or too hot, as finger size can change due to temperature and swelling.
How to choose if the ring size is between two numbers?
If the size is between two numbers, it should be determined based on the ring style, band width, and wearing habits. Wider rings usually require a looser fit, so it is recommended to try them on in person or consult a jewelry advisor.
Do wider rings need to be chosen larger?
Wider or thicker rings will cover more finger area and may feel tighter when worn, so you might need to choose a slightly larger size. The actual size still depends on the ring design and personal wearing habits.
What to do if you don't know the other person's size for the engagement ring?
You can measure the inner diameter or inner circumference of a ring that the other person usually wears, or bring the ring to the store for assistance from a jewelry consultant. Since the sizes of the left and right hands may differ, it is recommended to have the engagement ring size confirmed by a professional.
Further Reading and Shopping Suggestions
After confirming the ring size, you can further explore engagement rings, wedding jewelry, and available jewelry selections.
