United States Ring Size from a Circumference Measurement

Measure your finger's circumference in inches and enter this measurement into the calculator to get your US/Canadian ring size.

In addition to the ring size, this calculator will provide the ring's inside diameter based on your finger's circumference.

The measurements needed are in a decimal format.
You can convert a fraction by dividing the numerator by the denominator.

example:

2 7/16" = 2 + 7 ÷ 16 = 2.017857 in decimal inch
1 5/8" = 1 + 5 ÷ 8 = 1.625 in decimal inch
1 7/64 = 1 + 7 ÷ 64 = 1.109375 in decimal inch

Calculation

1. enter the circumference of the finger (in a decimal inch format)

Result

1. inside ring diameter in decimal inches
2. inside ring diameter in inch plus a fraction
3. the size of the ring