Finger Size Calculator
Choose whether you measured the finger's circumference or a ring's inside diameter, and enter it. The calculator converts it to US, UK, EU and Japanese ring sizes.
- Ring size
- Circumference
- Diameter
Wrap a strip of paper round the finger, mark it and measure it flat.
US ring size 0 is 36.5 mm round, and each size adds 2.55 mm. A finger that is 54.4 mm round is about a US 7, UK N and EU 54. The ring's inside diameter is about 17.3 mm.
Ring size chart
US, UK and EU. Search for a size.
| US | UK | EU | Diameter |
|---|---|---|---|
| 3 | F | 44 | 14.1 |
| 4 | H | 47 | 14.9 |
| 5 | J | 49 | 15.7 |
| 6 | L | 52 | 16.5 |
| 7 | N | 54 | 17.3 |
| 8 | P | 57 | 18.1 |
| 9 | R | 59 | 18.9 |
| 10 | T | 62 | 19.7 |
| 11 | V | 65 | 20.5 |
| 12 | X | 67 | 21.4 |
| 13 | Z | 70 | 22.2 |
Millimetres.
US size and finger
Ring sizes. Slide the size.
The ring is drawn with its inside diameter.
How to measure your finger
Finger to size. Step through it.
Strip
Wrap paper round.
Measure at the end of the day when fingers are largest.
US, UK or EU sizing
Size systems. Compare them.
Numbers.
Letters.
Millimetres.
EU sizes are simply the circumference in mm.
Before you order
Ring checks. Tick each item.
Tick each item as you go.
Wide bands fit tighter, go up half a size.
What you get
Ring sizing. Each tile explains one result.
Size.
Letter.
Number.
mm.
mm.
Fingers change size with temperature.
Frequently Asked Questions
No question matches that search.
How do I measure my finger size at home?
Wrap a strip of paper round it, mark it and measure the length in millimetres.
What is the average ring size?
About a US six for women and a US nine for men.
What size is fifty four millimetres?
About a US seven, UK N or EU fifty four.
Should a ring be tight or loose?
Snug enough to stay on, loose enough to slide over the knuckle.
Do wide rings need a bigger size?
Yes, go up about half a size for bands over six millimetres.
Can I use a ring I already own?
Yes. Measure its inside diameter and choose that option.
A ring that fits
Measure once and order the right ring size in any country's system.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.