Common Conversions & Formulas

1 mile = 5,280 feet

1 square yard = 9 square feet

1 cubic yard = 27 cubic feet

1 square = 100 square feet (roofing)

1 acre = 43,560 square feet

Pi = 3.14

Diameter = 2 * radius = circumference / 3.14

Area of a circle = 3.14 * radius2 = 3.14 * (0.5 * diameter)2  

Volume of a vertical round storage tank = height * 3.14 * radius2

Volume of a horizontal round storage tank = length * 3.14 * radius2

1 cubic foot = 7.48 US gallons

1 US gallon = 0.13368 cubic feet