Free printable ring sizer
Print this page at 100% scale, check the calibration box, then measure. No email, no sign-up.
PDF: print at 100% / actual size. Turn off “fit to page” and verify the 85.6 mm card box before measuring.
1. Calibration check
This box must be exactly 85.6 mm wide (a standard credit/ID card). If it is not, reprint at 100% and turn off fit to page.
2. Finger strip method
Cut out the strip, wrap it snugly around the base of your finger, and read the size where the start edge meets the scale.
3. Match a ring you own
Place a ring that fits over these circles until the inside edge matches one. Circles are the inner diameter at true scale.
14.9 mm
15.7 mm
16.5 mm
17.3 mm
18.1 mm
18.9 mm
19.8 mm
20.6 mm
21.4 mm
22.2 mm
4. Conversion chart
| US | UK | EU | JP | Inner diameter, millimetres | Circ mm |
|---|---|---|---|---|---|
| 3 | F½ | 44 | 4 | 14.07 | 44.2 |
| 4 | H½ | 47 | 7 | 14.88 | 46.8 |
| 5 | J½ | 49 | 9 | 15.70 | 49.3 |
| 6 | L½ | 52 | 12 | 16.51 | 51.9 |
| 7 | N½ | 54 | 14 | 17.32 | 54.4 |
| 8 | P½ | 57 | 16 | 18.14 | 57.0 |
| 9 | R½ | 60 | 18 | 18.95 | 59.5 |
| 10 | T½ | 62 | 20 | 19.76 | 62.1 |
| 11 | V½ | 65 | 23 | 20.57 | 64.6 |
| 12 | Y | 67 | 25 | 21.39 | 67.2 |
| 13 | Z½ | 70 | 27 | 22.20 | 69.7 |
For an engagement or non-resizable ring, confirm with a jeweler - a printed sizer is approximate.
Frequently asked questions
How do I use a printable ring sizer?
Print this page at 100% scale. Check the calibration box measures 85.6 mm - a standard credit-card width. Then either cut out the finger strip and wrap it around your finger, or place a ring you own over the matching circle.
Why must I print at 100% scale?
Printers often shrink pages to fit the margins, which makes the sizes wrong. Turn off fit to page or shrink to fit and confirm the calibration box is exactly 85.6 mm wide before measuring.
Is a printed ring sizer accurate?
Calculated dimensions are rounded chart values, not a measured accuracy guarantee. Ruler placement, print scale, screen calibration and the finger can change the result. Confirm with a physical sizer before ordering.