Bangle sizing advice:
I use diameter in centimetres for bangle sizing. I consider a 6cm diameter bangle is a small-medium, a 6.5 is medium, and a 7 is large.
Two options to work out what will fit:
1: Measure a well-fitting bangle you (or your intended recipient!) already own:
The measurement you're looking for is the internal diameter in centimetres. (This is a useful way of finding the right size for a gift for someone else!)
2. Measure your hand:
Pinch your fingers and thumb together to make your hand as small as possible. Wrap a piece of string snugly around the widest part (usually over or just below the first joint in your thumb) and then measure it.
Or use a flexible tape measure. Measure the string or read the tape measure, and divide by 3.14 to get the approximate size.