All this math got me interested - so I took the measurements off my own head.
Donor area = 32cm long X 4cm wide at the safe zone
Density average = 100cm2
12,800 grafts in the safe zone
FUE available to harvest with 60 grafts per cm left for coverage = 5120 grafts
That would lead me to the same conclusion as everyone else = I would need a density of 200 grafts per cm2 to achieve 10,000 FUE grafts
Now with the strip method - if I pulled half of my safe zone (32cm X 2cm) out I would have 6,400 grafts by strip to use.
I have one idea about the strip method - correct me if this is wrong:
When you cut out a section of skin and pull it closed you are pulling one side down and one side up - which lead me to believe you are lowering your safe zone by half of the strip on each procedure.
So in my case that would lower my safe zone by 1cm X 32cm - which may have to be filled in the future. And at 60 graft per cm - I could possibly need 1960 more graft in the future to fill in the lowered hairline from the strip.
Rough Conclusion:
FUE = 5,120 harvestable grafts
Strip = 6,400 harvestable grafts with possible 1920 needed in future
PJ