Pick the finger on which you want to wear your ring. The fingers on your dominant hand tend to be larger than those on your non-dominant hand, so keep that in mind when measuring for your ring size.
Ensure that your finger is at its normal size before taking a measurement. Cold weather can cause your fingers to shrink a bit, while heat or water retention caused by food, medications, or illness can cause finger swelling.
You can use either a string or a strip of paper to measure your finger or a ring you already own. See the charts below for further instructions.
How to use a string as a ring sizer
How to find your ring size with a ring you own
Use the ruler to measure the diameter of the inside of the ring, then look up the measurement on the chart to find the corresponding ring size.
1. Measure the diameter of the inside circle of the ring.
2. Use the chart below to find the corresponding ring size.