Here at U3, our ring sizes refer to the US size.

 

If you have an existing ring that fits:
- Measure the internal diameter of the ring, and use the below chart to determine your ring size.

US Size

3

4

5

6

7

8

9

10

11

12

13

Internal Diameter (mm)

14.1

14.9

15.7

16.5

17.3

18.1

18.9

19.7

20.5

21.3

22.1



If you do not have an existing ring that fits:
- Wrap a stretchable string, thread, ribbon, or a thin strip of paper around your finger, where you’d like your ring to be (usually closer to the knuckle).
- Mark the spot where the string overlaps meets. The smaller the mark is, the more accurate the measurement will be.
- Unwrap your marked length and measure the distance with a ruler.

US Size

3

4

5

6

7

8

9

10

11

12

13

Circumference (mm)

44.2

46.8

49.3

51.9

54.4

57.0

59.5

62.1

64.6

67.2

67.7

 

If you are still unsure about your ring size, please visit our store at 129 Ossington Avenue, Toronto, Ontario, Canada, and our staff will be happy to help you get the best measurement. If you do not live in proximity to the store, please contact us via email (info@u3official.com).