【How-to】What size is my ring finger

Stretch the length of string out along a ruler or measuring tape, and take down the length in millimeters. … The most common ring sizes for women are 6 (16.5 mm), 6.5 (16.9mm), and 7 (17.3 mm), while the most common men’s sizes are 10 (19.8mm), 10.5 (20.2 mm), and 11 (20.6 mm).