Some wig brands do come in different sizes: mini-petite, petite, average, large, extra large. You can find the measures of all these wig sizes at wigshop.com.
Other wigs come in one standard size.
For example, Janet Collection wigs, both human and synthetic, come in only one size, commonly called "one size fits all". However, that does not mean all people share the same shape or size of head.
Fortunately, most wigs come with an adjustable strap that allows you to make the wig tighter or wider.
If you are still not sure whether a wig from Janet Collection will fit your head, here are some helpful measures you can check.
You will need a tape measurer.
|Wig size|| Around the Head*|| Front to Back**|| Ear to Ear***|
| One fits all||20"-25"|| 14"- 15 1/4"||13"-14"|
Around the Head*- Measure around head. Start at your natural hairline in front. Measure around the back to the bend in your neck, above your other ear, then around front to strating point.
Front to Back**- Measure from your natural hairline in front, back over the crown to where your head meets the top of your neck.
Ear to Ear***- Starting in front of one ear where your hairline ends, bring your tape measure up and over the crown to the front of your other ear.