Most of us will wrap it up for the night and head to the local hair store first thing in the morning so we can buy more hair. Now if you ordered your hair offline, you may not be able to find the exact match, but usually pretty close. And if you purchased your hair at a significant savings online -- well that savings goes right out the window when you have to pay full price, all because you didn't order enough.
I can't stress enough - DO YOUR HAIR HOMEWORK! Find out how much hair comes in a bundle! It's better to have more and not need it than to run out in the middle of an install.
How Much Hair Should I Buy
Weaving hair is measured by grams or ounces. The better hair companies have bundles 3.5-4 ounces/100 grams or more. Other hair companies may lessen the amount in a bundle, but charge the same price. Read the fine print for in-store and online purchases.
Shorter lengths (12″, 14″, 16) typically have more length on the weft requiring less hair for a full sew-in. Longer lengths (18″ 20″ 22″) carry more weight with their vertical length, so the amount of hair on the weft horizontally will less.
It is important to check and double check how much hair comes in a bundle when ordering online or making an in-store purchase.
The basic rule of thumb is a full head (having your entire head weaved with no hair or minimal hair left out) will require 2-3 bundles for the shorter lengths, while longer hair will require 3-4 bundles.