How to Measure Your Wrist
You can measure your wrist using any of the following methods:
Place a tape measure around your wrist comfortably at your wrist bone and take that measurement.
String & Ruler
Take a piece of string long enough to wrap around your wrist at your wrist bone and mark where they meet. Then place the string on top of a ruler and take the measurement where you marked.
No need to add a buffer to any of the measurements as I build in the necessary ease so that your cuff will fit when you place your money inside.