There are seven levels of loss in the Norwood scale: Picture Table Below
Norwood 1 Normal head of hair with no visible hair loss.
Norwood 2 The hair is receding in a wedge-shaped pattern.
Norwood 3 Same receding pattern as Norwood 2, except the hairline has receded deeper into the frontal area and the temporal area.
Norwood 4 Hairline has receded more dramatically in the frontal region and temporal area than Norwood 3 and there is the beginnings of a bald spot at the back of the head.
Norwood 5 Same pattern as Norwood 4 but much reduced hair density.
Norwood 6 The strip of hair connecting the two sides of the head that existed in Norwood 4 and 5 no longer exists in Norwood 6.
Norwood 7 Norwood 7 shows hair receding all the way back to the base of the head and the sides just above the ears.