Find Your Perfect Ring Size in Seconds
Use our precision calibration tool to measure your ring size accurately from any device. No guesswork, no shipping delays.
Step 1: Calibrate Your Screen
Place a credit card on the screen and adjust the rectangle to match its size exactly.
Credit Card
Slide to match your credit card size
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Calibrate2
MeasureScreen Calibrated
US, UK, EU Sizes
100% Free
Prefer a Physical Guide?
Download our precision PDF ring sizer for the most accurate at-home measurement. Simply print at 100% scale and use our easy-to-follow instructions.
- Print at 100% scale (do not fit to page)
- Includes calibration ruler for accuracy
- Instant download, no email required
RingSizer Printable Guide
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Calibration ruler - should measure 5cm
Ring Size Conversion Chart
Convert between US, UK, EU ring sizes and inner diameter measurements. Find your perfect fit across different sizing standards.
| US Size | UK Size | EU Size | Diameter (mm) |
|---|---|---|---|
| 3 | F | 44 | 14.1 |
| 3.5 | G | 45 | 14.5 |
| 4 | H | 46.5 | 14.9 |
| 4.5 | I | 47.5 | 15.3 |
| 5 | J | 49 | 15.7 |
| 5.5 | K | 50 | 16.1 |
| 6 | L | 51.5 | 16.5 |
| 6.5 | M | 52.5 | 16.9 |
| 7 | N | 54 | 17.3 |
| 7.5 | O | 55 | 17.7 |
| 8 | P | 56.5 | 18.1 |
| 8.5 | Q | 58 | 18.5 |
| 9 | R | 59 | 18.9 |
| 9.5 | S | 60.5 | 19.4 |
| 10 | T | 62 | 19.8 |
| 10.5 | U | 63 | 20.2 |
| 11 | V | 64.5 | 20.6 |
| 11.5 | W | 65.5 | 21.0 |
| 12 | X | 67 | 21.4 |
| 12.5 | Y | 68 | 21.8 |
| 13 | Z | 69.5 | 22.2 |
* Measurements are approximate. For best results, use our ring sizer tool.
Frequently Asked Questions
Everything you need to know about measuring your ring size accurately.