Bangles are measured by their diameter, which is a straight line passing through the centre of the bangle, finishing at the inside edges of the bangle. To find the size of bangle to fit, you can measure the INNER diameter of an existing bangle or measure yourself using a flexible tape measure. Measure the hand that you intend to wear the bangle on as each hand can be a different size.
How to measure yourself for a bangle
Put your hand flat palm facing upwards and then bring your thumb across to sit next to your little finger. Wrap the tape measure over your top knuckles of your fingers which should be the widest part and PULL TIGHT. Take this measurement and see what size bangle would fit over your knuckles. For example I measure 19.5cm, so I would choose a Medium.