Use a ring that fits you to determine your ring
size. Print this chart and place your ring over the nearest size circle. The
inner edge of the ring should align with the outer edge of
the circle. If your ring appears to fit between two sizes,
buy the larger size.
Measure
Ring Size With a Finger Size Strip
To create your own ring sizer, print and cut
the strip below. Insert the narrow end of the sizer through
the "cut here" slot. With numbers on the outside, place the
loop around your finger, and pull until the fit is snug but
comfortable.