The cost of 4000 hair grafts can vary significantly depending on several factors such as the geographic location of the clinic, the reputation and experience of the surgeon, the technique used for the transplant, and any additional services included in the package. The cost of hair transplantation typically ranges from $4,000 to $15,000 or more in the United States. Consult with a qualified hair transplant surgeon to get an accurate estimate tailored to your specific needs and circumstances.