How to Measure The Ring Size

1. Use Paper or String to Measure the Size of the Ring

  • Wrap paper or string around your finger’s base.
  • Use a pencil to mark where the ends of paper or string meet.
  • Make a measurement of paper or string with a ruler.
  • Use the chart below to find the estimated size of the ring according to your measurement.
  • Remember that paper and string can twist and stretch influencing the accuracy of the measurement.

2. Use Another Ring to Make a Measurement

  • Make a measurement of the inside diameter of the ring with a ruler.
  • Use the chart below to find the estimated size of the ring according to your measurement.
  • If the ring falls between two sizes, order the larger size.

For Better Results

  • It is advised to use the second method (if possible), because paper or string can stretch influencing the accuracy of the measurement.
  • Measure your finger at the end of the day and when your fingers are warm (fingers are smaller in the early morning and when cold)
  • Measure your finger size 2 to 3 times to eliminate an erroneous reading. Avoid using string or paper to measure ring size as these materials can stretch or twist, yielding an inaccurate measurement.

International Ring Sizes: Conversion Chart

Adaleen’s International Ring Size Conversion Chart provides ring sizes for US, Canada, Australia, South Africa and Europe, and will help you to choose the measurement you need.

Inside DiameterInside CircumferenceSIZE
MMMMUS / CanadaJapan / Korea / SingaporeHong KongFranceUK / Australia / South Africa
15.3484.581047.75I
15.749.3591149J-½
16.150.65.5101250.25K-½
16.551.96111351.5L-½
16.953.16.51314.552.75M-½
17.354.47141654N-½
17.755.77.5151755.25O-½
18.1578161856.5P-½
18.558.38.5171957.75Q-½
1959.591820.559R-½
19.460.89.5192260.25S-½