Measure with a tape or string:

Go around your wrist with the tape/thread and mark where the tape/thread overlaps.

Unroll your ribbon/ string, cut at the mark and then measure the length between the two ends with a ruler.

When measuring, consider how you want to wear the watch (tight bracelet or loose bracelet).

Measuring with a tape measure:

Measure your wrist circumference at the point where you usually wear your watch.

When measuring, consider how you want to wear the watch (tight or loose).