International Ring Size Converter
Convert ring sizes between US, UK, EU, Japan, and other international systems. Find your perfect ring size with our converter.
How to Convert Ring Sizes
- 1 Enter your ring size number
- 2 Select the source sizing system (US, UK, EU, Japan, etc.)
- 3 Click Convert Size to see all international equivalents
- 4 View diameter and circumference measurements in mm
- 5 Use the measurement guide if you need to measure your finger
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Last updated: January 15, 2026 · v2.1