The complete online ring size chart โ use your screen, a ruler, or a string to find your UK ring size online right now. Three interactive tools, credit card calibration & full A to Z+6 size chart
This free online ring size chart gives you three interactive tools: a screen-based ring sizer you calibrate with your credit card, a ruler measurement tool for an existing ring, and a string/tape circumference calculator. All three give you an instant UK ring size with US, EU, and international conversions. No jeweller visit needed.
Place your physical credit or debit card flat on screen over the card below. Use the slider to resize the card on screen until it exactly matches your real card. Then click Calibrate.
Place a ring that fits well flat on a mm ruler. Measure the inner diameter โ from the inside of one edge to the inside of the other. Enter the measurement below for your instant online UK ring size.
Wrap it snugly around the base of the finger you want to measure. Mark or pinch where it overlaps.
The distance from the start to your mark is the finger circumference. Enter it below for your instant online UK ring size.
The tool will calculate your exact UK ring size, diameter, circumference, and international conversions instantly online.
Very accurate after credit card calibration. Accuracy depends on screen DPI consistency. Best for finger measurement without any tools.
Highest accuracy of home methods. Measures an existing well-fitting ring directly. Requires a ring you know fits and a mm ruler.
Good accuracy when performed carefully. Measure 2โ3 times and average. Always measure at end of day when finger is at its largest.
Inaccurate without calibration. Screen DPI varies significantly between devices. Always calibrate before relying on the screen sizer tool.
The gold standard. A UK jeweller uses steel mandrels and ring gauges for perfect accuracy. Free at most UK jewellers. Best for expensive rings.
Very accurate when printed at 100% scale on A4 and verified with credit card. Allows direct physical ring-over-circle comparison.
| UK | โ mm | Circ. mm | ๐บ๐ธ US | ๐ช๐บ EU | ๐ฏ๐ต JP | ๐ฎ๐ณ India | Category |
|---|---|---|---|---|---|---|---|
| A | 12.04 | 37.8 | โ | 37 | โ | โ | Child |
| C | 12.85 | 40.4 | 1.5 | 40 | 2 | 1 | Child |
| E | 13.67 | 42.9 | 2.5 | 43 | 4 | 3 | Women's Petite |
| G | 14.48 | 45.5 | 3.5 | 46 | 6 | 5 | Women's |
| H | 14.88 | 46.8 | 4 | 47 | 7 | 6 | Women's |
| I | 15.29 | 48.0 | 4.5 | 48 | 8 | 7 | Women's |
| J | 15.49 | 48.7 | 4.75 | 49 | 9 | 8 | Women's |
| K | 15.90 | 50.0 | 5.25 | 50 | 10 | 9 | Women's |
| L | 16.31 | 51.2 | 5.75 | 51 | 11 | 10 | Women's Pop. |
| M โญ | 16.71 | 52.5 | 6 | 53 | 12 | 11 | Most Common โ |
| N โญ | 17.12 | 53.8 | 6.5 | 54 | 13 | 12 | Women's Pop. |
| O | 17.53 | 55.1 | 7 | 55 | 14 | 13 | Unisex |
| P | 17.93 | 56.3 | 7.5 | 56 | 15 | 14 | Unisex |
| Q | 18.34 | 57.6 | 8 | 58 | 16 | 15 | Men's |
| R | 18.75 | 58.9 | 8.5 | 59 | 17 | 16 | Men's |
| S | 19.15 | 60.2 | 9 | 60 | 18 | 17 | Men's |
| T โญ | 19.56 | 61.4 | 9.5 | 61 | 19 | 18 | Most Common โ |
| U โญ | 19.96 | 62.7 | 10 | 63 | 20 | 19 | Men's Pop. |
| V โญ | 20.37 | 64.0 | 10.5 | 64 | 21 | 20 | Men's Pop. |
| W | 20.78 | 65.3 | 11 | 65 | 22 | 21 | Men's Large |
| X | 21.18 | 66.6 | 11.5 | 66 | 23 | 22 | XL |
| Y | 21.59 | 67.8 | 12 | 68 | 24 | 23 | XL |
| Z | 21.99 | 69.1 | 12.5 | 69 | 25 | 24 | XXL |
| Z+1 | 22.20 | 69.7 | 13 | 70 | 26 | 25 | Custom |
| Z+2 | 23.01 | 72.3 | 13.5 | 72 | 27 | 26 | Custom |
When shopping online from international ring retailers, you will see different size systems. Here is how UK M (women's) and UK T (men's) translate globally so you can order your online ring size correctly.
๐ Women's Average โ UK M (16.71 mm ยท 52.5 mm circ.)
๐ Men's Average โ UK T (19.56 mm ยท 61.4 mm circ.)
UK M = 16.71 mm ยท 52.5 mm circ. ยท US 6 ยท EU 53 โ most common women's online ring size ยท UK T = 19.56 mm ยท 61.4 mm circ. ยท US 9.5 ยท EU 61 โ most common men's ยท Always calibrate screen with credit card before using Tool 1 ยท Ruler method is most accurate at-home online tool ยท Between sizes? Order the larger.
To print circles at actual size, visit our Actual Size Ring Size Chart printable A4 guide. For a complete UK letter reference, see our Finger Ring Size Chart. For women-specific sizing, visit our Women's Ring Size Chart UK, or for men's, our Average Men's Ring Size UK guide. The GIA Ring Size Chart (Gemological Institute of America) is widely regarded as the most authoritative international ring size reference for online jewellery retailers.