The Most Accurate Online Ring Measurement Tool
Select your region and adjust the slider to match your ring's inner diameter. Use our online ring sizer for high accuracy.
*For best results, place a physical ring on your screen and adjust the slider until the blue circle matches the inner edge of the ring.
Use our comprehensive chart to convert between US, UK, EU, and Japanese ring sizes. Finding your perfect fit has never been easier.
| Inside Diameter (mm) | US Size | UK Size | EU Size | Japan Size |
|---|---|---|---|---|
| 14.0 | 3 | F | 44 | 4 |
| 15.0 | 4 | H | 47 | 7 |
| 16.5 | 6 | L ½ | 51.5 | 11 |
| 17.3 | 7 | N ½ | 54.5 | 14 |
| 18.1 | 8 | P ½ | 57 | 16 |
| 19.0 | 9 | R ½ | 59.5 | 18 |
| 19.8 | 10 | T ½ | 62.5 | 20 |
| 20.6 | 11 | V ½ | 65 | 23 |
You can use our online tool combined with a physical ring or a credit card for calibration. Alternatively, use a piece of string to measure the circumference of your finger and compare it to our diameter chart.
Yes, if properly calibrated! Our tool uses screen calibration with a standard credit card to ensure the pixels on your screen represent real-world millimeters accurately.
The average ring size for most women is between US 5 and 7, with US 6 being the most common.
Need to measure on the go? Download our highly-rated Ring Sizer app for iOS. It's the most reliable way to find your ring size using your phone.
