Men's Ring Size Chart
Most men wear a US ring size between 8 and 13, and the average lands around US 9 to 10 (about 19.0 to 19.8 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.
Men's ring sizes converted
| US | Diameter | Circumference | UK | EU | Japan |
|---|---|---|---|---|---|
| 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 |
| 9.5 | 19.4 mm | 60.8 mm | S 1/2 | 61 | 21 |
| 10 | 19.8 mm | 62.1 mm | T 1/2 | 62 | 22 |
| 10.5 | 20.2 mm | 63.3 mm | U 1/2 | 63 | 23 |
| 11 | 20.6 mm | 64.6 mm | V 1/2 | 65 | 24 |
| 11.5 | 21.0 mm | 65.9 mm | W 1/2 | 66 | 26 |
| 12 | 21.4 mm | 67.2 mm | Y | 67 | 27 |
| 12.5 | 21.8 mm | 68.5 mm | Z | 68 | 27 |
| 13 | 22.2 mm | 69.7 mm | Z+1 | 70 | 27 |
Sizes are unisex: a US 10 is the same physical ring whoever wears it. Men's sizes only skew larger on average. For the women's range, see the women's ring size chart.
Find his exact size
Averages are only a backup. To get the real size, measure a ring he already wears, or measure the finger directly. Enter the inner diameter or circumference below to convert it to every system.
US 10 is about US 10, UK T 1/2, EU 62.
Thin band chart size, with no fit adjustment.
Converted sizes
- US / Canada
- 10
- UK / Australia
- T 1/2
- EU / ISO
- 62
- Japan / China
- 22
- India
- 22
- Diameter
- 19.8 mm
- Circumference (mm)
- 62.1 mm
- Circumference (in)
- 2.444 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 men's ring size?
- The common fallback range is US 9 to 10, which is about 19.0 to 19.8 mm of inner diameter. Use it only when you cannot measure, because finger size varies a lot.
- Are men's and women's ring sizes different?
- No. The sizing systems are unisex, so a US 10 is the same physical size on anyone. Men's sizes only run larger on average because men's fingers tend to be larger.
- What is a men's size 10 ring in UK and EU?
- A US 10 is about UK T 1/2 and EU 62, with an inner diameter of roughly 19.8 mm and a circumference near 62 mm.
- How do I measure his ring size without him knowing?
- Borrow a ring he already wears on the right finger and measure its inner diameter, then enter it in the converter. If you cannot, start from the US 9 to 10 average and choose a resizable band.
Get your exact size, without the jeweler
Buying for him? Skip the guesswork. Measure his 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
