Ring size converter
Enter a size in any system, the inside diameter of a ring you own, or the circumference of your finger, and the page shows the matching size in every chart.
- Charts and measurements
- Free, no sign-up
Runs in your browser. Nothing you type or open is uploaded. Free to use, no account. More converters
How to use it
- Choose what you know: a ring size, a ring's diameter or your finger's circumference.
- Enter the size or the measurement in millimetres.
- Read the size in each system and the nearby sizes in the table.
Measuring at home
To measure a ring, lay it flat on a ruler and read the inside width in millimetres from edge to edge. To measure a finger, wrap a strip of paper around the base of the finger, mark where it overlaps, and measure the length in millimetres; that is the circumference.
Fingers swell when warm and shrink when cold, so measure at the end of the day at a normal temperature, and choose the larger size if you fall between two. Wide bands fit tighter than thin ones, so go up a half size for bands wider than 6 mm.
Private by design
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Everything runs in this page and stays on your device. Measurements are converted inside this page.
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Questions
How do I find my ring size at home?
Measure the inside diameter of a ring that fits, or wrap paper around your finger and measure the length in mm, then enter it here.
What is a US size 7 in UK and India?
A US 7 has an inside diameter of about 17.3 mm. Enter 7 with the US system to see the UK letter and the Indian and Japanese numbers next to it.
What if I am between two sizes?
Choose the larger one, especially for wide bands, since a ring has to pass over the knuckle.
Are ring size charts the same everywhere?
Charts vary slightly between jewellers. Use the diameter or circumference to compare, and check the shop's own chart when you can.
From the same developer
- Units Converter & Calculator: the matching app.
