Ring Size Converter

How to Use the Ring Size Converter

The Ring Size Converter translates ring sizes between US, UK/Australian, European, Japanese, and millimeter-based sizing systems. It also guides you through measuring your finger at home using simple materials you already have, so you can order rings online with confidence.

Converting Ring Sizes

Enter your ring size in any system and see all equivalent sizes instantly. A US size 7 converts to UK N 1/2, EU 54.4, and Japanese 14. A US size 10 converts to UK T 1/2, EU 62.1, and Japanese 20. The converter handles half sizes and quarter sizes for precise matching.

Ring Sizing Systems

US/Canada: Numbered system from 1-16, with half sizes. Based on the inner circumference in increments of approximately 0.032 inches.

UK/Australia: Alphabetical system from A-Z, with half sizes. A corresponds roughly to US 0.5, Z to US 12.5.

European: Based on the inner circumference in millimeters. EU 50 means a 50 mm inner circumference.

Diameter (mm): The most universal measurement. US size 7 has an inner diameter of approximately 17.3 mm.

How to Measure Your Ring Size at Home

String Method: Wrap a piece of string or thin paper strip snugly around the base of your finger. Mark where it overlaps. Measure the length in millimeters. This gives the circumference; use the converter to find your size.

Existing Ring Method: Place a ring that fits well on a ruler and measure the inside diameter in millimeters. A 17.3 mm diameter = US size 7.

Tips for Accurate Measurement

Measure at the end of the day when fingers are largest. Measure multiple times for consistency. Ensure the string passes over the knuckle, which is often the widest point. Temperature affects finger size; cold fingers are smaller. If between sizes, choose the larger size for comfort.

Frequently Asked Questions

Q: What is the average ring size?

A: The average women ring size is US 6-7 (16.5-17.3 mm diameter). The average men ring size is US 9-10 (19.0-19.8 mm diameter). These are general averages and individual sizes vary widely based on hand size, body weight, and genetics.

Q: Do ring sizes vary between brands?

A: Slightly, yes. Manufacturing tolerances mean the same labeled size can differ by 0.1-0.3 mm between jewelers. For expensive purchases, get sized at the specific jeweler where you will buy the ring. For online purchases, know your measurement in millimeters for the most accurate fit.

Q: Can rings be resized?

A: Most rings can be resized up or down by 1-2 sizes. Gold, silver, and platinum resize easily. Tungsten, titanium, and ceramic cannot be resized. Rings with continuous settings (eternity bands) are difficult to resize. When in doubt about size, many online retailers offer free resizing or exchanges.