Ring Size Chart: Measure Your Ring Size at Home
Use a paper strip or a ring you already own. Type in one measurement and get your US size, EU size, inside diameter and circumference, plus the full ring size chart.
You do not need a jeweler to find your ring size. A strip of paper and a ruler get you within half a size, and a ring you already own gets you even closer. Type one measurement in and this tool gives you your US size, the EU size, and the exact diameter and circumference.
How to measure your ring size at home
Method 1: paper strip. Cut a thin strip of paper, about a quarter inch wide. Wrap it around the base of the finger, snug but not tight. Mark the spot where the paper overlaps. Lay the strip flat and measure from the end to the mark in millimeters. That is your circumference.
Method 2: a ring you own. Pick a ring that fits the same finger well. Measure straight across the inside, from one inner edge to the other, in millimeters. Do not include the metal. That is the inside diameter.
Use string, not thread. Thread stretches and gives you a size too small. Paper or non-stretch string is more accurate.
Ring size chart
| US size | Diameter | Circumference | EU / ISO |
|---|---|---|---|
| 3 | 14.0 mm | 44.2 mm | 44 |
| 4 | 14.8 mm | 46.8 mm | 47 |
| 5 | 15.7 mm | 49.3 mm | 49 |
| 5.5 | 16.1 mm | 50.6 mm | 50.5 |
| 6 | 16.5 mm | 51.9 mm | 52 |
| 6.5 | 16.9 mm | 53.1 mm | 53 |
| 7 | 17.3 mm | 54.4 mm | 54.5 |
| 7.5 | 17.7 mm | 55.7 mm | 55.5 |
| 8 | 18.1 mm | 57.0 mm | 57 |
| 8.5 | 18.5 mm | 58.3 mm | 58.5 |
| 9 | 19.0 mm | 59.5 mm | 59.5 |
| 10 | 19.8 mm | 62.1 mm | 62 |
| 11 | 20.6 mm | 64.6 mm | 64.5 |
| 12 | 21.4 mm | 67.2 mm | 67 |
| 13 | 22.2 mm | 69.7 mm | 70 |
The most common women’s ring sizes in the US are 6 to 7. That is a useful sanity check: if your measurement says size 3 or size 12, measure again before you order.
Ring size chart in cm
Measured your finger or a ring in centimeters? Use this chart to turn cm into a ring size. Circumference is the distance around the inside of the ring, and diameter is the distance straight across the inside. If you measured in millimeters, move the decimal one place: 52 mm is 5.2 cm.
| US | UK | Circumference | Diameter |
|---|---|---|---|
| 3 | F | 4.42 cm | 1.40 cm |
| 3.5 | G | 4.55 cm | 1.44 cm |
| 4 | H | 4.68 cm | 1.48 cm |
| 4.5 | I | 4.80 cm | 1.52 cm |
| 5 | J½ | 4.93 cm | 1.57 cm |
| 5.5 | K½ | 5.06 cm | 1.61 cm |
| 6 | L½ | 5.19 cm | 1.65 cm |
| 6.5 | M½ | 5.31 cm | 1.69 cm |
| 7 | N½ | 5.44 cm | 1.73 cm |
| 7.5 | O½ | 5.57 cm | 1.77 cm |
| 8 | P½ | 5.70 cm | 1.81 cm |
| 8.5 | Q½ | 5.83 cm | 1.85 cm |
| 9 | R½ | 5.95 cm | 1.90 cm |
| 9.5 | S½ | 6.08 cm | 1.94 cm |
| 10 | T½ | 6.21 cm | 1.98 cm |
| 10.5 | U½ | 6.34 cm | 2.02 cm |
| 11 | V½ | 6.46 cm | 2.06 cm |
| 11.5 | W½ | 6.59 cm | 2.10 cm |
| 12 | Y | 6.72 cm | 2.14 cm |
| 12.5 | Z | 6.85 cm | 2.18 cm |
| 13 | Z+1 | 6.97 cm | 2.22 cm |
UK and Australian ring sizes use letters instead of numbers, so a US 7 is about an N½. If your cm measurement falls between two sizes, choose the larger one.
Get the fit right
Measure at the end of the day. Fingers swell in the afternoon and in warm weather, and shrink in the cold and first thing in the morning. An evening measurement is the safest.
Mind the knuckle. If your knuckle is wider than the base of your finger, measure both. Pick a size that slides over the knuckle, or the ring will never go on.
Wide bands need a bigger size. A band 6 mm or wider covers more skin and feels tighter. Go up half a size.
Between sizes, go up. A ring that is slightly loose can be fixed with a small sizer insert. A ring that is too tight just stays in the drawer.
Ring size by finger
Every finger is a different size. Your ring finger is usually about half a size smaller than your middle finger, and your dominant hand is usually a quarter to half a size larger than the other. Always measure the exact finger the ring is for.
Stacking rings? Measure the finger once and buy all the stack in the same size, unless one ring is much wider than the others. For more ways to style your hands, see our nail colors for your skin tone and the nail shape quiz.
Frequently Asked Questions
Keep going: pick your metal with the undertone finder, and your nail look with the nail shape quiz.
