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