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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
How to Use This Calculator
  1. Select Measurement Type: Inner Circumference or Inner Diameter.
  2. Measure your finger using a string or strip of paper, then enter the measurement in millimeters.
  3. Review US Ring Size as the primary output, along with UK, EU, and Japanese sizes.
  4. Note Comfort Fit (US) if the ring has a domed interior β€” comfort-fit rings size slightly larger.
  5. Check Diameter (mm) and Circumference (mm) to confirm your measurements match the outputs before ordering.
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