๐ Fashion & Sizing
Ring Size Calculator
Ring sizes run on a fixed 2.55 millimetre step per size in US sizing, measured as the inside circumference of the band. Fingers swell through the day and in warm weather, so measure at the end of the day and round up rather than down.
How it works
What do you have
Measurement
Preferred fit
US ring size
Inside diameter
Inside circumference
Sizing advice
Frequently asked questions
How do I use the Ring Size Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.