How to Measure Your Ring Size at Home
Measure the inside diameter of a ring that already fits, or wrap a strip of paper around the base of your finger and measure its length in millimetres, then match the result to the chart below. Measure at the end of the day when your hands are warm. If you fall between two sizes, choose the larger one.
Method 1: a ring you already own
- Choose a ring that fits the finger you are buying for, and fits well.
- Lay it flat on a ruler and measure the inside diameter, edge to edge across the centre, excluding the metal.
- Find the closest inside diameter in the chart.
Our ring size guide also has an on-screen sizer: calibrate it with a bank card, place your ring on the screen and it gives you the size.
Method 2: a strip of paper
- Cut a strip of paper about 1 cm wide. Paper is better than string, which stretches.
- Wrap it around the base of the finger, snug but not tight.
- Mark where the end overlaps, then lay it flat and measure to the mark in millimetres. That is your circumference.
- Find the closest circumference in the chart.
Ring size chart
| US | EU (ISO) | Italy | Inside diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 4 | 47 | 7 | 14.9 | 46.8 |
| 5 | 49 | 9 | 15.7 | 49.3 |
| 6 | 52 | 12 | 16.5 | 51.9 |
| 7 | 54 | 14 | 17.3 | 54.4 |
| 8 | 57 | 17 | 18.1 | 57.0 |
| 9 | 59.5 | 19.5 | 18.9 | 59.5 |
| 10 | 62 | 22 | 19.8 | 62.1 |
European sizes under ISO 8653 are simply the inside circumference in millimetres. Italian sizes are the same figure minus 40.
Getting it exactly right
- Time and temperature. Fingers swell through the day and in heat and shrink in the cold. Measure in the evening at room temperature, and measure twice on different days if you can.
- Knuckles. If your knuckle is larger than the base of your finger, the ring must pass over it. Measure both and choose a size between the two, nearer the knuckle.
- Band width. Wide bands fit more tightly than slim ones. For bands over about 5 mm, or for a stack of rings, go up half a size.
- Hands differ. Your dominant hand is usually slightly larger. Measure the finger you will actually wear it on.
- Between sizes. Choose the larger. A slightly loose ring is comfortable; a tight one rarely is.
Buying as a surprise
Borrow a ring they wear on the same finger, measure its inside diameter, and put it back. If that is impossible, trace the inside of the ring on paper, or press it into a bar of soap to keep an impression. If the size turns out wrong, rings can be returned within 14 days of delivery, unworn and in their original packaging.