How would I calculate 5 acres?

Answer 1

43560 sq ft per acre

5 * 43,560 = 217,800 square feet

Answer 2

An acre is the name of a unit of area in a number of different systems, including Imperial units and United States customary units. The most commonly used acres today are the international acre and, in the United States, the survey acre.

There are always 4,840 square yards or 43,560 square feet in an acre. Because of alternative definitions of a yard or a foot, the exact size of an acre also varies slightly. Related units of length are the acre's length of one furlong (220 yards) and the acre's breadth of one chain (4 rods or 22 yards).

The acre is often used to express areas of land. In the metric system, the hectare is commonly used for the same purpose. An acre is approximately 0.4 hectares.

One acre is slightly less than 91 yards on an American football field, with the full field, including the end zones, covering approximately 1.32 acres.

Equivalence to other units of area
1 international acre is equal to the following metric units:

4046.8564224 square metres
0.40468564224 hectares
1 United States survey acre is equal to:

4046.87261 square metres
0.404687261 hectares
1 acre (both variants) is equal to the following customary units:

4840 square yards
160 square rods (1 square rod is 0.00625 acres)
10 square chains
4 rood
A chain by a furlong (chain 22 yards, furlong 220 yards)
0.0015625 square miles (1 square mile is equal to 640 acres)
1 international acre is equal to the following Indian unit:

100 Indian cents (1 cent is equal to 0.01 acres)