Ring Size Chart UK
UK ring sizes are letters, running from about F to Z. This page converts between UK letter sizes, European numbers, US numbers and the actual measurement of your finger in millimetres.
How to measure your ring size at home
You need a strip of paper around 5mm wide, or a piece of string, and a ruler marked in millimetres.
- Wrap the paper or string around the base of the finger the ring will sit on, snug but not tight.
- Mark where it overlaps, lay it flat and measure the length in millimetres. That is your finger circumference.
- Find the closest circumference in the chart below and read across for your UK, European or US size.
Measuring a ring you already own
If you have a ring that fits the same finger, measure the inside edge to edge in millimetres. That is the inside diameter — the second column in the chart.
Can you measure a ring size on your phone?
Not reliably. Phone screens differ in size and in how they scale images, so an on-screen ring sizer can be out by a full size or more. Printed sizers only work if the page is printed at exactly 100% with no scaling. A strip of paper and a ruler is more accurate than either.
Converting US and European ring sizes to UK
European ring sizes are the finger circumference in millimetres, so a European 54 means 54mm around the finger. UK sizes are letters and US sizes are numbers, and neither converts by a fixed offset — read across the chart below rather than adding or subtracting.
These are the conversions looked up most often:
- US 5 is UK J 1/2
- US 6 is UK L 1/2
- US 7 is UK N 1/2
- US 8 is UK P 1/2
- US 9 is UK R 1/2
- US 10 is UK T 1/2
- US 11 is UK V 1/2
- US 12 is UK X 1/2
Going the other way, whole UK letters often fall between two US sizes — a UK L sits between US 5 1/2 and US 6 — which is why some cells in the chart are left blank.
Three things worth knowing before you measure
- Measure at the end of the day. Fingers are at their largest when warm, and swell slightly in heat.
- The knuckle has to pass through. If your knuckle is noticeably wider than the base of your finger, size to the knuckle instead.
- Wide bands sit tighter than narrow ones. Baltic Dew rings are approximately 10mm high as standard, so if you fall between two sizes, go up by half a size.
UK, Europe and USA ring size conversion chart
| Finger circumference (mm) | Inside diameter (mm) | UK | Europe | USA |
|---|---|---|---|---|
| 44.2 | 14.1 | F 1/2 | 44 | 3 |
| 44.8 | 14.3 | G | 45 | |
| 45.5 | 14.5 | G 1/2 | 3.5 | |
| 46.1 | 14.7 | H | 46 | |
| 46.8 | 14.9 | H 1/2 | 47 | 4 |
| 47.4 | 15.1 | I | ||
| 48.0 | 15.3 | I 1/2 | 48 | 4.5 |
| 48.7 | 15.5 | J | ||
| 49.3 | 15.7 | J 1/2 | 49 | 5 |
| 50.0 | 15.9 | K | 50 | |
| 50.6 | 16.1 | K 1/2 | 5.5 | |
| 51.2 | 16.3 | L | 51 | |
| 51.9 | 16.5 | L 1/2 | 52 | 6 |
| 52.5 | 16.7 | M | ||
| 53.1 | 16.9 | M 1/2 | 53 | 6.5 |
| 53.8 | 17.1 | N | ||
| 54.4 | 17.3 | N 1/2 | 54 | 7 |
| 55.1 | 17.5 | O | 55 | |
| 55.7 | 17.7 | O 1/2 | 7.5 | |
| 56.3 | 17.9 | P | 56 | |
| 57.0 | 18.1 | P 1/2 | 57 | 8 |
| 57.6 | 18.3 | Q | ||
| 58.3 | 18.5 | Q 1/2 | 58 | 8.5 |
| 58.9 | 18.8 | R | 59 | |
| 59.5 | 19.0 | R 1/2 | 9 | |
| 60.2 | 19.2 | S | 60 | |
| 60.8 | 19.4 | S 1/2 | 61 | 9.5 |
| 61.4 | 19.6 | T | ||
| 62.1 | 19.8 | T 1/2 | 62 | 10 |
| 62.7 | 20.0 | U | ||
| 63.4 | 20.2 | U 1/2 | 63 | 10.5 |
| 64.0 | 20.4 | V | 64 | |
| 64.6 | 20.6 | V 1/2 | 11 | |
| 65.3 | 20.8 | W | 65 | |
| 65.9 | 21.0 | W 1/2 | 66 | 11.5 |
| 66.6 | 21.2 | X | ||
| 67.2 | 21.4 | X 1/2 | 67 | 12 |
| 67.8 | 21.6 | Y | ||
| 68.5 | 21.8 | Z | 68 | 12.5 |
| 69.1 | 22.0 | Z 1/2 | 69 | |
| 69.7 | 22.2 | 70 | 13 | |
| 70.4 | 22.4 | Z+1 | 71 | |
| 71.0 | 22.6 | Z+2 | 13.5 |
Ordering a Baltic Dew ring
Each ring is cut and shaped to a fixed size, so it cannot be resized afterwards. That is why you enter your size when ordering rather than picking from stock.
If the size you order turns out to be wrong, I will remake it in the correct size once, free of charge — you only cover the postage.
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