Petite Fits heads 21 inches and smaller

Average Fits heads 21 to 22 inches

Large Fits heads 22 inches and larger

Assume all wigs are made in the average size, unless wig description says petite or large cap size. Most wigs have a Velcro or eye hook adjustment tab that allows you to increase or decrease size, to about 1/2 inch smaller or larger.

Measure your head size with a tape measure
going around the head behind the ears,
from the nape of the neck to the hairline.
Match your measurement to the sizes above.