Use our free ring size converter to determine your ring size by circumference or diameter

The most complete and #1 source for your ring size conversions. Accurately determine what ring size you are in all international sizing standards.

For quick and accurate conversions between all international ring size systems, use our calculator. Simply enter any size or measurement and get all its equivalents instantly.

Ring size conversion chart for ring sizes from the United States, UK, Italy, France, Spain, Germany and Japan.

Feb 18, 2026 · A complete ring size conversion chart covering US, EU, UK, and international sizing systems - with inner diameter and circumference in millimeters for precise measurements.

Measure the string or paper against a ruler to get the circumference of your finger. Divide that by 3.14 to get the diameter of your finger. Look up your ring size using the form above. Determine your ring size …

Whether you are hunting for the wedding or engagement ring size for your partner, searching for US ring size equivalents, or racking your brain on what's that beautiful ring size in inches, this ring size …

Free ring size chart and converter. Measure your ring size at home with our printable chart or online tools. US, UK, EU size conversions.

This complete guide helps you find your US ring size, convert to international standards, understand ring sizes in mm, use ring size charts, and measure your finger at home.

Feb 17, 2026 · Here’s the accurate ring size guide with step-by-step measurements, conversion chart, and sizing tips. Find out the ring size at home without mistakes.