Find your ring size
Measure a ring on your screen — or your finger — and get every size.
Not calibrated yet: the circle assumes 96 pixels per inch, so it may be off. Calibrate once with any bank card — if you calibrated the online ruler on this screen, that counts too.
Lay a ring that fits you flat on the circle. Make the circle bigger or smaller — drag it, or use the slider or − and + — until its edge lines up with the inside edge of the ring.
17.3 mm
Your ring size
- Inside diameter:
- 17.3 mm (0.68 in)
- Inside circumference:
- 54.3 mm (2.14 in)
| Country | Size |
|---|---|
| US & Canada | 7 |
| UK, Ireland & Australia | N½ |
| Europe (ISO 8653) | 54between 54 and 55 |
| France (same as ISO) | 54between 54 and 55 |
| Italy, Spain & Switzerland | 14between 14 and 15 |
| Germany (inside diameter, mm) | 17.25 |
| Japan (号) | 14 |
| Korea (호) | 14 |
Not calibrated yet: the circle assumes 96 pixels per inch, so it may be off. Calibrate once with any bank card — if you calibrated the online ruler on this screen, that counts too.
- Measure at the end of the day, when your hands are warm: fingers are smaller in the morning and in the cold.
- A wide band (6 mm or more) fits tighter: take half a size up.
- Between two sizes? Take the larger one.
Nothing leaves your device
This tool runs entirely in your browser. What you type, play or record here stays on your device: nothing is uploaded or saved on a server.
How it works
- Calibrate the screen once by holding a bank card against it — it takes a few seconds and is remembered.
- Lay a ring that fits you on the circle and resize it until the edge meets the inside of the ring; or measure your finger with a strip of paper and type the length.
- Read your size in every country’s system, with the inside diameter and circumference.
Frequently asked questions
- How do ring sizes compare between countries?
- A US 7 has an inside diameter of about 17.3 mm and a circumference of 54.4 mm: that is UK N½, German 17¼ and Japanese 14, and it falls between European 54 and 55 (Italian and Spanish 14 and 15). A US 6 (16.5 mm across) is UK L½, European 52 and Italian 12, and falls between Japanese 11 and 12.
- How accurate is measuring on a screen?
- After calibrating with a bank card it is accurate to a few tenths of a millimetre — about a quarter of a US size. Without calibration the circle assumes a standard screen and may be off.
- How do I measure without a ring?
- Wrap a strip of paper round the base of your finger, mark where it overlaps and measure it: that is the circumference. At the end of the day and in the warm your fingers are at their fullest; go half a size up for wide bands.
- Can I print a ring sizer?
- Yes — the printable ring sizer has a strip to wrap round your finger and circles to lay a ring on, at real size.
- Is anything uploaded?
- No. It is measured in your browser; the calibration is kept on this device.