Ring Size Guide

Using an existing ring that already fits you well, you can use a ruler to measure the inside diameter of this ring. Just use a ruler and measure straight across the inside of the ring from edge to edge.

Inside Diameter Inside Circumference Ring Size Conversion
MM Inches MM Inches UK & Australia US & Canada EU German Japan
15.7 0.618 49.32 1.94 J 1/2 5 48.5 15 3/4 9
16.1 0.634 50.58 1.99 L 5.5 50 16 10
16.51 0.65 51.87 2.04 M 6 51 16 1/2 12
16.92 0.666 53.16 2.09 N 6.5 52.5 17 13
17.35 0.683 54.51 2.15 O 7 55 17 1/4 14
17.75 0.699 55.76 2.2 P 7.5 56 17 3/4 15
18.19 0.716 57.15 2.25 Q 8 57.5 18 16
Also Keep In Mind:
  • Fingers typically measure larger in the summer when it is hotter and smaller in the winter when it is cold.
  • Fingers measure larger in the morning than in the afternoon.
  • Fingers on your dominant hand are often larger than on your non-dominant hand.

  • As a general rule of thumb, the wider the band, the snugger the fit so consider sizing up on all rings with larger bands.