Calculators Ring Size Calculator

Ring Size Calculator

Convert between US, UK, EU, and Asian ring sizes. Calculate from diameter or circumference measurements

Measurement Method

Choose how you want to measure

Enter Measurement

Measure the inner diameter of your ring

Typical range: 14mm (size 3) to 23mm (size 13)

How to Measure

1
Use Existing Ring

Measure inner diameter with ruler

2
Measure Finger

Wrap string, mark, then measure

3
Best Time

Measure at end of day (fingers largest)

4
Temperature

Avoid measuring when cold/hot

US Ring Size
-
Enter measurement

International Sizes

UK / Australia -
European (EU) -
Japanese -
Chinese -

Measurements

Inner Diameter -
Circumference -

Sizing Tips

  • • Size varies by finger
  • • Wide bands need +0.5 size
  • • When unsure, size up
  • • Get professionally sized

International Ring Size Chart

Quick reference for size conversions

US Size UK Size EU Size Diameter (mm) Circumference (mm)
3F4414.044.0
4H4714.846.5
5J4915.649.0
6L5216.551.9
7N5417.354.4
8P5718.156.9
9R6019.059.7
10T6219.862.2

Ring Size Calculator Guide & Articles

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Frequently Asked Questions

Common questions about the Ring Size Calculator