Women:
Using a tape measure, measure the wrist adding 1". The tape measure should touch the skin but not tightly. If you don't have a tape measure
1. Mark a piece of string and measure with a ruler adding 1"
2. Measure a watch you already have adding an 1" to 1 1/4"
3. Find a bracelet that fits nicely and measure from end to end.

If you are purchasing a bracelet as a gift and don't have their wrist size, you can consider this scale:
(Please keep in mind that this may not be accurate for everyone)

7" - petite, 7 1/4" - small, 7 1/2" - medium, 7 3/4" - large, 8" - x-large

Little Girls:
Using a tape measure, measure the wrist and add 1/2' for children under 2 and add 3/4" for children 2 and over.
To help with children sizes you can go by the chart below. These sizes are approximate sizes only.

4" - newborn
4 1/2"" - 3-6 months
4 3/4" - 6-12 months
5" - 18-24 months
5 1/2" - 2 years
5 3/4" - 3 years
6" - 4-5 years
6 1/2" - 6-7 years
6 3/4" - 8-12 years