I've always heard that the rule of thumb is: One cow per acre or One horse per 3 acres. The difference is that a horse pulls up the grass and a cow cuts the grass.
Also - It can depend on where the property is... south Texas is more like 2 acres per cow, farther north can be 2 per acre.
Answer: 100 acres = 4,356,000 ft²
Answer: 100 mi² = 64,000 acres
100' x 100' = 10,000 ft² = 0.229568411 acres.
100 yd2 is 0.0206612 acres.
4,356,000 square feet is are in 100 acres.
100 acres is 627,264,000 square inches.
100 square meters = about 0.025 acres.
Answer: 100 acres = 4,356,000 ft²
100' x 900' equals 2.07 acres.
80' x 100' = 0.184 acres.
100 acres = 4356000 sq feet.
4.9 acres.