How to Calculate Volume of Water?

How to calculate volume of water in a rectangle or square tank you will take the length x width x depth to get the cubic feet. Then take the cubic feet x 7.47 which will provide you with gallons. If you have a round tank use the formula 3.1417 x R(2) x Depth to get cubic feet. The radius will be 1/2 of the diameter. To calculate the gallons use cubic feet x 7.47. For more information look here: