This is good question i want to talk,because lots of people don`t know how many hairextensions they need at frist time.A full head of extensions range from 5 to 9 packs of hair, assuming each pack contains 20 strands, 1g per strand.However, Hairextensionscenter have 0.75g per strand,0.7g,0.6 etc. lots of choice for you. If your client has fine, thin hair with some layers and about shoulder length, 5 to 6 packs may be enough.
If the people has a blunt bob that is medium to thick in density, you will require about 10 to 12 packs of hair since you will need to blend the extensions in for a natural look.
For most clients, you will need at least 5 packs or 100 strands of hair extensions. The number of hair extension packages you need will be based on the length and thickness of the client’s hair and the length and volume the client wants to achieve. This is why it is very important to have the client come in for a consultation prior to installation.
For thin hair, from the occipital bone down, it will take about 50- 60 strands; from the occipital up, to the crown, it will take 50-60 strands.
For medium/thick hair, from the occipital bone down it will take 60- 80 strands; from the occipital bone up, to the crown it will take 50-80 strands.
Remember, if the hair of your client is thicker or shorter, more often than not, you will need more packages of hair extensions to be able to blend the hair in, making it easy for you to create a natural look.