Men's Ring Size Chart
This chart covers US 8 to 13 in half sizes, with matching UK, EU, Japanese, diameter, and circumference estimates. Use a measurement of the intended finger rather than a demographic average to choose a size.
Published by Ring Sizer · App developer: Pawel Boguta · Updated
Blue Nile's 2017 retail guidance lists US 8 to 10.5 as commonly purchased men's sizes, with US 9 the most popular. This is retail guidance, not a population average. Read the source.
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 | — |
| 13 | 22.2 mm | 69.7 mm | Z+1 | 70 | — |
Sizes are unisex: a US 10 is the same physical ring whoever wears it. 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
- 22
- India
- 22
- Diameter
- 19.8 mm
- Circumference (mm)
- 62.1 mm
- Circumference (in)
- 2.444 in
Uses the Ring Sizer conversion model. Measured values and nominal size conversions can round differently. Use thin band for a chart conversion. See our methodology and supported ranges.
Frequently asked questions
- What is the average men's ring size?
- Blue Nile's 2017 retail guidance lists US 8 to 10.5 as commonly purchased men's sizes, with US 9 the most popular. This is retail guidance, not a population average.
- Are men's and women's ring sizes different?
- No. The sizing systems are unisex, so a US 10 is the same nominal size regardless of who wears it.
- 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 measure, ask the retailer about a sizing kit and resizing options.
Sources and methodology
Read our conversion rules, supported ranges, and measurement limitations.
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 Ring Sizer app, free to download with in-app purchases.
Download Ring Sizer- Free download · In-app purchases
- iOS
- No sign-up
- Works offline
