💍 Ring Size Converter
Convert ring sizes between US, UK, EU, and mm diameter measurements.
📏 Measure Your Finger
Enter circumference (mm) or diameter (mm)
| US | UK | EU | Diameter (mm) | Circumference (mm) |
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Ring Size Converter
Convert ring sizes between US, UK, and EU systems. Enter your finger measurement in mm to find your size in all systems.
Frequently Asked Questions
How do I measure my ring size?
Wrap a string around your finger, mark where it overlaps, measure the length in mm, and divide by π (3.14159) to get the diameter.
Are ring sizes universal?
No, ring sizing varies by country. Use this converter to find your equivalent size in different systems.
What about half sizes?
This chart shows standard sizes. If you're between sizes, it's usually best to go up.