Average Ring Size
Average women's ring size is usually US 6 to 7. Average men's ring size is usually US 9 to 10. Treat averages as a backup, not a measurement.
Women
US 6-7
About 16.5-17.3 mm inside diameter.
Men
US 9-10
About 19.0-19.8 mm inside diameter.
Are men's and women's ring sizes the same?
Yes. Ring size systems are unisex, so a US 7 is the exact same physical size whether a man or a woman wears it. There is no separate men's or women's scale, only the same millimeter measurement labeled the same way. Sizes differ only on average, because men's fingers tend to be larger: women commonly land around US 6 to 7 (about 16.5 to 17.3 mm inside diameter) and men around US 9 to 10 (about 19.0 to 19.8 mm).
Use averages only when you cannot measure.
Finger size changes by hand, finger, temperature, time of day, and band width.
Average sizes converted
| Use case | US | Diameter | Circumference | UK | EU |
|---|---|---|---|---|---|
| Women's range | 6 | 16.5 mm | 51.9 mm | L 1/2 | 52 |
| Women's range | 7 | 17.3 mm | 54.4 mm | N 1/2 | 54 |
| Men's range | 9 | 18.9 mm | 59.5 mm | R 1/2 | 60 |
| Men's range | 10 | 19.8 mm | 62.1 mm | T 1/2 | 62 |
Check a guessed size
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.
Don't guess, measure
Averages are only a backup. Before you buy, measure the real finger right on screen and see 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
