Ring Size (ISO/US) Calculator
Calculate your ring size from the inner diameter of your finger.
mm
Result
53,4071 (ISO)
Ring size: ISO 53,4071 / US 6,6066
Result in all units
Step-by-step solution
What Is Ring Size?
Ring size determines the appropriate ring number based on your finger circumference. It is found from the inner circumference or inner diameter.
How is it calculated?
How Is It Calculated?
- Enter your finger circumference (mm) or the inner diameter of your current ring.
- The corresponding ring size is found.
The circumference (mm) is converted to a number according to the sizing standard.
Frequently Asked Questions
Does finger size change during the day?
Yes; fingers swell a little in heat and at the end of the day, so it is helpful to measure at different times of the day.