2 Sam 14:26 And when he polled his head, (for it was at every year's end
that he polled it: because the hair was heavy on him, therefore he polled
it:) he weighed the hair of his head at two hundred shekels after the king's
weight.
From what I understand, there was a king's weight and a common weight. By
the king's weight, if my math is right, Absalom had about 5 pounds of the
stuff.