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Calcimator

Ring Size Calculator

Convert ring inner circumference or diameter to US, UK, EU, and Japanese ring sizes with comfort fit recommendations.

Inputs

mm

Results

US Ring Size

6

UK Ring SizeUK S
EU Ring Size52.4
Japanese Size19
Comfort Fit (US)6.5
Diameter16.68 mm
Circumference52.4 mm

US Ring Size

6

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Measurement Type — Choose whether you are measuring the inside circumference or diameter of a ring. Choose from: Inner Circumference, Inner Diameter. default: 1.
  3. Measurement — Enter the inner circumference or diameter of the ring in millimeters. Accepts values from 10 mm to 100 mm (default: 52.4 mm).
  4. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  5. US Ring Size — shown as a numeric value. This is the primary result of this calculator.
  6. UK Ring Size — your calculated result.
  7. EU Ring Size — shown as a numeric value.
  8. Japanese Size — shown as a numeric value.
  9. Comfort Fit (US) — shown as a numeric value.
  10. Diameter — shown as a numeric value.
  11. Circumference — shown as a numeric value.
  12. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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