Ring Size Calculator
Convert between international ring sizes and physical measurements.
Frequently Asked Questions
How can I measure my ring size at home?
You can easily measure your ring size using household items. Wrap a piece of string or a thin strip of paper around the base of your finger. Mark the exact spot where the ends overlap. Lay it flat and measure the length against a ruler in millimeters. This measurement represents the Inside Circumference. Enter that number into our calculator above to find your exact size in any country's standard.
Are online ring size calculators accurate?
The conversions provided by our online ring size calculator are mathematically exact according to international jewelry sizing standards. However, accuracy ultimately depends on how well you take your initial physical measurement. It's recommended to measure your finger at the end of the day when it is slightly swollen for the most comfortable fit.
Is there a difference in ring sizes between countries?
Yes, ring sizing systems vary wildly across the globe:
- US & Canada: Uses a numeric scale (e.g., 6, 6.5, 7) that scales proportionally by diameter.
- UK & Australia: Uses an alphabetical scale (e.g., L, M, N) including half-sizes.
- Europe: The most straightforward system, where the size number directly matches the inside circumference in millimeters (e.g., EU size 54 means a 54mm circumference).
- India, Japan, China: Each use their own distinct numeric scales.
Our tool instantly acts as a global ring size chart, bridging the gap between all these systems.