How To Find the Capacity of a Rectangular Tank.

Calculate the Tank’s Volume in Cubic Feet. The product of the length, width and depth equals volume. 

The Volume of a tank in Cubic feet is equal to the tank area multiplied by the tank height. The capacity in gallons is equal to the Volume in cubic feet multiplied by 7.48 gallons per cubic feet.

How to find the capacity of a rectangular or square tank:

Multiply length (L) by Width (W) to get area (A). Multiply area by height (H) to get volume (V). Multiply volume by 7.48 gallons per cubic feet to get capacity (C).

A = L X W

V = A x H

     C = V x 7.48

We find  the capacity of a rectangular tank 18 feet (ft) long, 15 (ft) wide, and 10 (ft) high:

A = 18 ft x 15 ft = 270 square feet (ft²)

    v = 270 ft² x 10 ft = 2,700 cubic feet (ft³)

C = 2,700 ft³ x 7.48 gal/ft³ = 20,196 gal