← ← All Tools
中文

💍 Ring Size Converter

Convert ring sizes between US, UK, EU, JP, CN

💡 Wrap a string around your finger, measure the length for circumference (mm); or measure the inner diameter of an existing ring with calipers (mm).

More tools you might find useful.

👙
Bra Size Converter
Convert bra sizes between 6 systems + sister sizes
🖥️
Screen PPI Calculator
Calculate PPI, PPCM, total pixels, aspect ratio, and physical dimensions from resolution and screen size.
👟
Shoe Size Converter
Convert shoe sizes between US, UK, EU, JP, CN
🚗
Tire Size Calculator
Calculate tire dimensions and compare sizes
🎂
Age Calculator
Calculate exact age and day difference from birth date with timezone aware handling.

Free online ring size converter. Convert between US, UK, EU, JP, CN, and IT ring sizing systems. Enter finger circumference or inner diameter in mm, or convert from a known size. Includes a complete ring size chart. Perfect for online jewelry shopping, engagement ring selection, and international purchases.