Paper ring gauge — print at 100%, no scaling
First check the scale: the rectangle below must exactly match a bank card. If it doesn't, reprint with scaling set to 100% or "Actual size". Then lay a ring you own over the circles until one matches the inside of the band.
Free tool · The Stainless Jewelry
Find your ring size in about a minute
Calibrate the screen with any bank card, then measure a ring you already own — or the finger itself. No printer required, though there is a printable gauge at the bottom.
Ring sizer
Calibrate the screen
Hold any bank, ID or loyalty card against the screen and resize the outline until the two match exactly. Every card is 85.60mm wide, so this teaches the page how big your pixels are.
Screen scale: 3.86 px per mm
This line is exactly 10 cm. Hold a ruler against it — if it reads something else, the calibration above is off, not your finger.
Measure
Lay the ring flat on the screen and resize the circle until it sits exactly inside the band — match the inner edge, not the outer.
Inner diameter: 16.5 mm
Your size
Before you order
- TIME
- Fingers swell through the day and in heat. Measure in the late afternoon or evening, when your hands are warm — a cold-morning measurement runs up to half a size small.
- BAND
- Wide bands sit tighter. For anything 6mm or wider, go up half a size.
- KNUCKLE
- If your knuckle is much larger than the base of the finger, measure both and pick something in between — the ring has to pass the knuckle but not spin once it's on.
- STEEL
- Stainless steel rings cannot be resized. Unlike gold or silver, the metal can't be cut and soldered back — so the size you order is the size you keep. Worth a second measurement.
- GIFT
- Borrow a ring they already wear on the same finger and measure that. Failing that, the most common women's size is 6 and men's is 10.
Full conversion chart
| US | Inner × mm | Circ. mm | UK / AU | EU | Japan |
|---|---|---|---|---|---|
| 3 | 14.1 | 44.2 | F | 44 | 4 |
| 3.5 | 14.5 | 45.5 | G | 46 | — |
| 4 | 14.9 | 46.7 | H | 47 | 7 |
| 4.5 | 15.3 | 48.0 | I | 48 | 8 |
| 5 | 15.7 | 49.3 | J½ | 49 | 9 |
| 5.5 | 16.1 | 50.6 | K½ | 51 | 10 |
| 6 | 16.5 | 51.8 | L½ | 52 | 11 |
| 6.5 | 16.9 | 53.1 | M½ | 53 | 13 |
| 7 | 17.3 | 54.4 | N½ | 54 | 14 |
| 7.5 | 17.7 | 55.7 | O½ | 56 | 15 |
| 8 | 18.1 | 56.9 | P½ | 57 | 16 |
| 8.5 | 18.5 | 58.2 | Q½ | 58 | 17 |
| 9 | 18.9 | 59.5 | R½ | 60 | 18 |
| 9.5 | 19.4 | 60.8 | S½ | 61 | 19 |
| 10 | 19.8 | 62.1 | T½ | 62 | 20 |
| 10.5 | 20.2 | 63.3 | U½ | 63 | 22 |
| 11 | 20.6 | 64.6 | V½ | 65 | 23 |
| 11.5 | 21.0 | 65.9 | W½ | 66 | 24 |
| 12 | 21.4 | 67.2 | X½ | 67 | 25 |
| 12.5 | 21.8 | 68.4 | Z | 68 | 26 |
| 13 | 22.4 | 70.3 | Z1 | 70 | — |