Ring Size Finder
Find your perfect ring size by entering your finger measurements below. Our calculator converts between different sizing systems and provides recommendations for a comfortable fit.
Measuring Tips: For the most accurate results, measure your finger toward the end of the day (when fingers may be slightly larger). Avoid measuring when your hands are cold, as fingers tend to be smaller than their usual size.
How to Measure Your Ring Size at Home
Method 1: String or Paper Strip Method
- Wrap a piece of string or a narrow strip of paper around the base of your finger.
- Mark the point where the string or paper overlaps to form a complete circle.
- Measure the length from the beginning to the mark in millimeters or inches.
- Enter this measurement as the circumference in our calculator.
Method 2: Measure an Existing Ring
- Find a ring that fits the intended finger properly.
- Measure the internal diameter of the ring (straight across the inside) in millimeters.
- Enter this measurement as the diameter in our calculator.
- Alternatively, if you know your ring size in a specific system, select "Existing Ring Size".
Ring Size Chart
| US | UK | EU | JP/CH | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|---|
| 0 | A | 37.8 | 1 | 12.04 | 37.80 |
| ½ | B | 39.1 | 2 | 12.45 | 39.10 |
| 1 | C | 40.4 | 3 | 12.85 | 40.40 |
| 1½ | D | 41.7 | 4 | 13.26 | 41.70 |
| 2 | E | 42.9 | 5 | 13.67 | 42.90 |
| 2½ | F | 44.2 | 6 | 14.07 | 44.20 |
| 3 | G | 45.5 | 7 | 14.48 | 45.50 |
| 3½ | H | 46.8 | 8 | 14.88 | 46.80 |
| 4 | I | 48.0 | 9 | 15.29 | 48.00 |
| 4½ | J | 49.3 | 10 | 15.70 | 49.30 |
| 5 | K | 50.6 | 11 | 16.10 | 50.60 |
| 5½ | L | 51.9 | 12 | 16.51 | 51.90 |
| 6 | M | 53.1 | 13 | 16.92 | 53.10 |
| 6½ | N | 54.4 | 14 | 17.32 | 54.40 |
| 7 | O | 55.7 | 15 | 17.73 | 55.70 |
| 7½ | P | 57.0 | 16 | 18.14 | 57.00 |
| 8 | Q | 58.3 | 17 | 18.54 | 58.30 |
| 8½ | R | 59.5 | 18 | 18.95 | 59.50 |
| 9 | S | 60.8 | 19 | 19.35 | 60.80 |
| 9½ | T | 62.1 | 20 | 19.76 | 62.10 |
| 10 | U | 63.4 | 21 | 20.17 | 63.40 |
| 10½ | V | 64.6 | 22 | 20.57 | 64.60 |
| 11 | W | 65.9 | 23 | 20.98 | 65.90 |
| 11½ | X | 67.2 | 24 | 21.39 | 67.20 |
| 12 | Y | 68.5 | 25 | 21.79 | 68.50 |
| 12½ | Z | 69.7 | 26 | 22.20 | 69.70 |
| 13 | Z+1 | 71.0 | 27 | 22.61 | 71.00 |
| 13½ | Z+2 | 72.3 | 28 | 23.01 | 72.30 |
| 14 | Z+3 | 73.6 | 29 | 23.42 | 73.60 |
| 14½ | Z+4 | 74.8 | 30 | 23.83 | 74.80 |
| 15 | Z+5 | 76.1 | 31 | 24.23 | 76.10 |
Ring Size FAQs
When is the best time to measure my ring size?
Measure your ring size at the end of the day when your fingers are at their largest. Body temperature, activity level, and time of day can all affect finger size.
Why do my fingers change size?
Fingers can change size due to temperature changes, water retention, weight fluctuations, and even seasonal variations. This is why it's important to consider your climate when selecting a ring size.
How tight should a ring fit?
A properly fitting ring should slide over your knuckle with slight resistance and feel snug but comfortable on your finger. You should be able to remove it with some effort, but it shouldn't spin freely or slide off easily.
What if I'm between sizes?
If you're between sizes, it's generally better to choose the larger size, especially for wider bands. For cold climates, choose the smaller size; for hot climates, opt for the larger size.