The amount of dreadlock extensions you’ll need varies based on several factors including diameter of the dreadlock, your hair cut, and the thickness of your hair. For Kinky Afro hair types the amount of dreadlocks can range from 40 to 60 extensions for thick and medium dreadlocks and 80 to 120 extensions for skinny dreadlocks. For Straighter hair types the average is typically between 40 and 50 extensions for a full head and sometimes 60-70 extensions for skinny dreadlocks or very thick hair types.