How to measure for  bangles-

All you need to do is make a closed fist and measure the distance across the knuckles, from the center of the outside knuckle to the center of the outside knuckle.

 Select the closest bangle size:

 Petite or Child  2.25 inches
  Small  2.5 inches
  Medium 2.75 inches
 Large 3.0 inches

The easiest way to measure is to put a of piece string around your wrist and measure the length.
The standard measurement is 7.5

Petite 6.75" inches
Small 7."" inches
Medium 7.50" inches
Large 8"" inches