Ring Size Converter

Convert between US, UK, EU ring sizes and inner diameter in millimeters.

Ring Size Chart

USUKEUDiameter (mm)Circumference (mm)
4H46.514.946.8
5J4915.749.3
6L51.516.551.8
7N5417.354.4
8P5718.156.9
9R5919.059.5
10T6219.862.1
11V64.520.664.6
12X6721.467.2
13Z69.522.269.7

How to Measure Your Ring Size

Method 1: Measure an Existing Ring

  1. Find a ring that fits the intended finger well
  2. Measure the inner diameter in millimeters
  3. Use the converter above to find your size

Method 2: String or Paper Method

  1. Wrap a string or strip of paper around your finger
  2. Mark where it overlaps
  3. Measure the length (circumference) in mm
  4. Divide by 3.14159 (π) to get diameter

Tips:

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