@farmerman,
one acreft=(5280 ft/mi)^2*(1 mi^2/640 acre)*(1 ft/ft)=43560 ft^3/acreft= 75,271,680 in^3/acreft
1 tablespoon = 0.90234375 in^3
so
1 acreft=75,271,689 in^3/(0.90234375in^3/tsp)=83,417,965.7134 tsp (call it 83,417,966 tsp)
so one acre foot is about 83,417,966 tablespoons.
Rap