Ring Size Chart Circumference: The Essential Guide to Choosing the Right Ring Size
The ring size circumference is how big it is around the inside. It is usually given in millimeters or inches. We’ll show you how to measure ring size circumference properly and provide you with tips to get the right fit.
Ring size circumference chart
| Inside Diameter (inches) | Inside Diameter (mm) | Inside Circumference (inches) | Inside Circumference (mm) | USA & Canada | British, Irish, Australian & New Zealand | European |
|---|---|---|---|---|---|---|
| 0.458 | 11.6 | 1.438 | 36.5 | |||
| 0.466 | 11.8 | 1.463 | 37.2 | |||
| 0.474 | 12 | 1.488 | 37.8 | A | ||
| 0.482 | 12.2 | 1.513 | 38.4 | A 1/2 | ||
| 0.49 | 12.4 | 1.539 | 39.1 | 1 | B | |
| 0.498 | 12.6 | 1.564 | 39.7 | 1 1/4 | B 1/2 | |
| 0.506 | 12.9 | 1.589 | 40.4 | 1 1/2 | C | |
| 0.514 | 13.1 | 1.614 | 41 | 1 3/4 | C 1/2 | |
| 0.522 | 13.3 | 1.639 | 41.6 | 2 | D | 1.5 |
| 0.53 | 13.5 | 1.664 | 42.3 | 2 1/4 | D 1/2 | |
| 0.538 | 13.7 | 1.689 | 42.9 | 2 1/2 | E | 2.75 |
| 0.546 | 13.9 | 1.714 | 43.5 | 2 3/4 | E 1/2 | |
| 0.554 | 14.1 | 1.74 | 44.2 | 3 | F | 4 |
| 0.562 | 14.3 | 1.765 | 44.8 | 3 1/4 | F 1/2 | 5.25 |
| 0.57 | 14.5 | 1.79 | 45.5 | 3 1/2 | G | |
| 0.578 | 14.7 | 1.815 | 46.1 | 3 3/4 | G 1/2 | 6.5 |
| 0.586 | 14.9 | 1.84 | 46.7 | 4 | H | |
| 0.594 | 15.1 | 1.865 | 47.4 | 4 1/4 | H 1/2 | 7.75 |
| 0.602 | 15.3 | 1.89 | 48 | 4 1/2 | I | |
| 0.61 | 15.5 | 1.915 | 48.7 | 4 3/4 | J | 9 |
| 0.618 | 15.7 | 1.941 | 49.3 | 5 | J 1/2 | |
| 0.626 | 15.9 | 1.966 | 49.9 | 5 1/4 | K | 10 |
| 0.634 | 16.1 | 1.991 | 50.6 | 5 1/2 | K 1/2 | |
| 0.642 | 16.3 | 2.016 | 51.2 | 5 3/4 | L | 11.75 |
| 0.65 | 16.5 | 2.041 | 51.8 | 6 | L 1/2 | 12.75 |
| 0.658 | 16.7 | 2.066 | 52.5 | 6 1/4 | M | 12.75 |
| 0.666 | 16.9 | 2.091 | 53.1 | 6 1/2 | M 1/2 | 14 |
| 0.674 | 17.1 | 2.116 | 53.8 | 6 3/4 | N | |
| 0.682 | 17.3 | 2.141 | 54.4 | 7 | N 1/2 | 15.25 |
| 0.69 | 17.5 | 2.167 | 55 | 7 1/4 | O | |
| 0.698 | 17.7 | 2.192 | 55.7 | 7 1/2 | O 1/2 | 16.5 |
| 0.706 | 17.9 | 2.217 | 56.3 | 7 3/4 | P | |
| 0.714 | 18.1 | 2.242 | 56.9 | 8 | P 1/2 | 17.75 |
| 0.722 | 18.3 | 2.267 | 57.6 | 8 1/4 | Q | |
| 0.73 | 18.5 | 2.292 | 58.2 | 8 1/2 | Q 1/2 | |
| 0.738 | 18.7 | 2.317 | 58.9 | 8 3/4 | R | 19 |
| 0.746 | 18.9 | 2.342 | 59.5 | 9 | R 1/2 | |
| 0.754 | 19.2 | 2.368 | 60.1 | 9 1/4 | S | 20.25 |
| 0.762 | 19.4 | 2.393 | 60.8 | 9 1/2 | S 1/2 | |
| 0.77 | 19.6 | 2.418 | 61.4 | 9 3/4 | T | 21.5 |
| 0.778 | 19.8 | 2.443 | 62.1 | 10 | T 1/2 | |
| 0.786 | 20 | 2.468 | 62.7 | 10 1/4 | U | |
| 0.794 | 20.2 | 2.493 | 63.3 | 10 1/2 | U 1/2 | 22.75 |
| 0.802 | 20.4 | 2.518 | 64 | 10.3/4 | V | |
| 0.81 | 20.6 | 2.543 | 64.6 | 11 | V 1/2 | |
| 0.818 | 20.8 | 2.569 | 65.2 | 11 1/4 | W | 25 |
| 0.826 | 21 | 2.594 | 65.9 | 11 1/2 | W 1/2 | |
| 0.834 | 21.2 | 2.619 | 66.5 | 11 3/4 | X | |
| 0.842 | 21.4 | 2.644 | 67.2 | 12 | X 1/2 | 27.5 |
| 0.85 | 21.6 | 2.669 | 67.8 | 12 1/4 | Y | |
| 0.858 | 21.8 | 2.694 | 68.4 | 12 1/2 | Z | 28.75 |
| 0.866 | 22 | 2.719 | 69.1 | 12 3/4 | Z 1/2 | |
| 0.874 | 22.2 | 2.744 | 69.7 | 13 | ||
| 0.882 | 22.4 | 2.769 | 70.3 | 13 1/4 | Z1 | |
| 0.89 | 22.6 | 2.795 | 71 | 13 1/2 | ||
| 0.898 | 22.8 | 2.82 | 71.6 | 13 3/4 | Z2 | |
| 0.906 | 23 | 2.845 | 72.3 | 14 | Z3 | |
| 0.914 | 23.2 | 2.87 | 72.9 | 14 1/4 | ||
| 0.922 | 23.4 | 2.895 | 73.5 | 14 1/2 | Z4 | |
| 0.93 | 23.6 | 2.92 | 74.2 | 14 3/4 | ||
| 0.938 | 23.8 | 2.945 | 74.8 | 15 | ||
| 0.946 | 24 | 2.97 | 75.4 | 15 1/4 | ||
| 0.954 | 24.2 | 2.996 | 76.1 | 15 1/2 | ||
| 0.962 | 24.4 | 3.021 | 76.7 | 15 3/4 | ||
| 0.97 | 24.6 | 3.046 | 77.4 | 16 |
How do I know my ring circumference?
- Cut a thin strip of paper.
- Wrap the paper around your finger. Make sure the paper is below the joint of your finger and close to your knuckle.
- Mark the spot where the paper meets and measure the distance with your ruler.
- Use the ring size circumference chart to determine your ring size. Rings also come in half sizes. These measurements will fall somewhere in between the whole sizes.
Ring Size Circumference Calculator
Enter In Length in Metres to get the output in Feet, Inches and Centimetres.
FAQ about the ring size circumference
The size of a ring determines how big it is around. In general, the following formula can be used to figure out a ring’s circumference:
Circumference = π x diameter
Where is the constant number pi (approximately 3.14).
In the US, a size 7 ring typically has a circumference of 54.4 mm or 2.116 inches.
In the US, a size 8 ring typically has a circumference of 56.9 mm or 2.242 inches.
Rings with a circumference of 7 cm are US size 13 1/4.
To convert circumference to ring size, you have to measure the circumference of your finger. Once you have this measurement, look at a ring size chart to find your ring size based on the circumference measurement. Ring size charts usually list the ring sizes that go with different circumference measurements.
For more detailed information about the ring size chart, please refer to: