How many grafts for a hair transplant? (photo)

From the picture, you have a Class 3 pattern of balding. Of course, I would want to examine you to see if there is balding behind the forelock you are showing, but assuming what I am seeing is all the balding you have, I would estimate something between 1500-2000 grafts depending upon your hair thickness (fine, medium or coarse) with finer hair requiring more grafts.