Ring Size Calculator

Convert ring sizes between US, European, and UK systems. Calculate your perfect size from finger measurements.

Ring Size Input

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Your Ring Size (US)
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Understanding Ring Sizes

Ring sizing systems vary worldwide. The US system uses a numerical scale (typically 3-13 for common sizes), the European system uses the internal circumference in millimeters, and the UK system uses an alphabetical scale. Accurate sizing is crucial for comfort and security, especially for valuable jewelry.

Finger size fluctuates throughout the day and across seasons. Fingers are typically largest in the evening and during warm weather. For the most accurate measurement, measure at the end of the day at a comfortable room temperature. Wider bands (over 6mm) typically require a half to full size larger than narrow bands.

Professional sizing at a jeweler is always recommended for expensive purchases. Home measurement methods using string or paper can be off by half a size or more. Ring sizers (plastic or metal gauge sets) available at jewelry stores provide the most accurate at-home results.

Frequently Asked Questions

How do I measure my ring size at home?
Wrap a thin strip of paper or string snugly around the base of your finger. Mark where it overlaps, then measure the length in mm. This is your circumference. Enter it above for your ring size. Measure in the evening at room temperature for best accuracy.
What is the average ring size?
Average women's ring size is US 6-6.5 (16.5mm diameter). Average men's ring size is US 10-10.5 (19.8mm diameter). These vary by body type, age, and climate.
Should I size up or down if between sizes?
If between sizes, size up for comfort. Rings that are too tight are uncomfortable and hard to remove. A slightly loose ring can be secured with a ring guard. For wide bands (6mm+), always go up half a size from your measurement.