What the Norwood scale actually measures
The Norwood scale describes the pattern of male hair loss, from a slightly receded hairline at stage 2 to loss across the top of the scalp at stage 6 and 7. It is useful shorthand, but it describes a shape rather than a number. Two men at the same stage can need graft counts a thousand apart, because density per square centimetre, hair calibre and available donor supply all differ.
Why the real number is measured, not estimated
At your consultation a trichoscope reads density per square centimetre across both the thinning area and the donor zone. That gives a graft count that is counted rather than guessed, and it is written down along with the technique and the total cost before you commit to anything.
Why more grafts is not automatically better
Your donor area is a fixed lifetime supply. Emptying it in one sitting to chase a low per-graft quote leaves nothing for the crown in ten years. Good planning spends grafts where density actually reads to the eye — the frontal third first, the crown only when supply allows.
What happens after the estimate
If the reading suggests surgery is not the right answer yet — because loss is recent, diffuse, or driven by thyroid, iron or medication — you get treatment and a review date instead of a quote. That happens more often than you would expect.