Apple Watch Band Size Chart
About 8 out of 10 people will fit a size "M/L".
If you have especially small wrists, consider S/M. If your wrist is larger than a standard watch strap, choose XL.
For a more exact measurement:
Use a measuring tape, or wrap a string or strip of paper around your wrist. When using a string/strip of paper, mark the spot where it overlaps with itself, then measure it with a ruler. Refer to the table below to find your size.
If all else fails and your band does not fit, just contact me for a free exchange 👍