Women's Ring Size Chart
Most women wear a US ring size between 4 and 9, and the average lands around US 6 to 7 (about 16.5 to 17.3 mm inside diameter). The chart below converts that range to UK, EU/ISO, Japan, diameter, and circumference, computed from the same engine as the app.
Women's ring sizes converted
| US | Diameter | Circumference | UK | EU | Japan |
|---|---|---|---|---|---|
| 4 | 14.9 mm | 46.8 mm | H | 47 | 7 |
| 4.5 | 15.3 mm | 48.0 mm | I | 48 | 8 |
| 5 | 15.7 mm | 49.3 mm | J 1/2 | 49 | 9 |
| 5.5 | 16.1 mm | 50.6 mm | K 1/2 | 51 | 10 |
| 6 | 16.5 mm | 51.9 mm | L 1/2 | 52 | 12 |
| 6.5 | 16.9 mm | 53.1 mm | M 1/2 | 53 | 13 |
| 7 | 17.3 mm | 54.4 mm | N 1/2 | 54 | 14 |
| 7.5 | 17.7 mm | 55.7 mm | O 1/2 | 56 | 15 |
| 8 | 18.1 mm | 57.0 mm | P 1/2 | 57 | 17 |
| 8.5 | 18.5 mm | 58.2 mm | Q 1/2 | 58 | 18 |
| 9 | 18.9 mm | 59.5 mm | R 1/2 | 60 | 19 |
Sizes are unisex: a US 7 is the same physical ring whoever wears it. Women's sizes only skew smaller on average. For the men's range, see the men's ring size chart.
Find her exact size
Averages are only a backup. To get the real size, measure a ring she already wears, or measure the finger directly. Enter the inner diameter or circumference below to convert it to every system.
US 7 is about US 7, UK N 1/2, EU 54.
Thin band chart size, with no fit adjustment.
Converted sizes
- US / Canada
- 7
- UK / Australia
- N 1/2
- EU / ISO
- 54
- Japan / China
- 14
- India
- 14
- Diameter
- 17.3 mm
- Circumference (mm)
- 54.4 mm
- Circumference (in)
- 2.142 in
Computed with the same conversion engine as the Ring Sizer app. Use thin band for pure chart conversion; use a wider band when you want a fit recommendation.
Frequently asked questions
- What is the average women's ring size?
- The common fallback range is US 6 to 7, which is about 16.5 to 17.3 mm of inner diameter. Use it only when you cannot measure, because finger size varies a lot.
- What is a women's size 7 ring in UK and EU?
- A US 7 is about UK N 1/2 and EU 54, with an inner diameter of roughly 17.3 mm and a circumference near 54 mm.
- Are women's and men's ring sizes different?
- No. The sizing systems are unisex, so a US 7 is the same physical size on anyone. Women's sizes only run smaller on average because women's fingers tend to be smaller.
- How do I find her ring size without her knowing?
- Borrow a ring she already wears on the right finger and measure its inner diameter, then enter it in the converter. If you cannot, start from the US 6 to 7 average and choose a resizable band.
Get your exact size, without the jeweler
Buying for her? Skip the guesswork. Measure her ring right on screen and read the size in every system at once, the most accurate option short of a trip to the jeweler, with the free Ring Sizer app.
Download Ring Sizer- Free
- iOS
- No sign-up
- Works offline
