What volume do I need to extend or how much packs do I need to buy?
Unfortunately there is no general rule or formula that will allow counting the needed volume on your own base and the needed length of extended hair.
There is no conception that for double lengthening you will need two volumes or for lengthening for 4 inches you will need one volume. Also not a single expert wouldn’t be able to say by a photo how many packs you will need to get a natural effect. Before buying you should meet your expert so he could help you to buy the right amount of tapes. Also our managers will be glad to help you choose the right amount of packs.