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Ring Size Converter – US, UK, EU & Inside Diameter

Convert ring sizes between US, UK, EU and Japan, or find your size from a ring's inside diameter or your finger's circumference.

  • Free, no sign-up
  • Runs in your browser, nothing uploaded

About the Ring Size Converter

Find the right ring size anywhere: convert between US, UK, European and Japanese sizes, or work out your size from a measurement in millimetres.

Key features

  • US, UK, EU and Japanese sizes
  • Find your size from a measurement
  • Inside diameter or circumference
  • Half sizes from US 3 to 13
  • Full ring size chart
  • Instant results

Convert ring sizes or find yours

Ring sizes use different systems in different countries. Convert a known size, or measure a ring or your finger to find your size.

Ring size chart

US / CanadaUK / AustraliaEUDiameter
5J½4915.7 mm
6L½5216.5 mm
7N½5417.3 mm
8P½5718.1 mm
9R½6018.9 mm
10T½6219.8 mm
11V½6520.6 mm

Tips

  • Wide bands fit more tightly; go up half a size for bands wider than 6 mm.
  • Knuckles: if your knuckle is large, pick a size that slides over it.

Shoe size converter, gold price calculator, and length converter.

How to use the Ring Size Converter

  1. Enter the value you want to convert and choose its unit.
  2. Pick any regional option, such as marla size, bigha region or ingredient.
  3. Every equivalent appears instantly, with reference tables below.
  4. Change the value or unit to compare; nothing needs to be submitted.

Frequently asked questions

How do I measure my ring size at home?

Measure the inside diameter of a ring that fits you, or wrap a strip of paper around the base of your finger, mark where it overlaps and measure the length (the circumference). Enter either one in millimetres.

What is the most common ring size?

Around US 6–7 for women and US 9–10 for men, but fingers vary widely.

What does the EU ring size mean?

European (ISO) ring sizes are the inside circumference in millimetres, rounded: a size 54 ring has an inside circumference of about 54 mm.

When is the best time to measure?

At the end of the day, when fingers are at their largest, and not when your hands are cold. If you're between sizes, choose the larger one.

Why do land units like marla and bigha have different sizes?

They're traditional units that were standardized differently in different places. A marla is 272.25 sq ft in revenue records but 225 sq ft in many Lahore housing societies, and a bigha varies widely between Indian states. The converters let you choose the size used in your area.

Are size charts the same for every brand?

No. The charts use common international equivalents, but brands can differ by up to half a shoe size or one clothing size. Check the brand's own chart when you can.

Do these converters work offline?

Yes. Once a page has loaded, every converter works in your browser without a connection.

Last updated:

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