How much water is in there?

Question

How many gallons of water is in a round pool 15 ft across and 3 ft deep?

Answer 1

The volume of a cylinder is ( pi ) ( r^2 ) ( h ).

In your case, r is 7 1/2 feet and h is 3 feet.

The volume of a US gallon of water is 0.133681 cubic feet.

Compute the volume of your pool, then divide by the volume to get the number of gallons.

Answer 2

Volume = (15 / 2 )^2 times pi times 3 cubic feet.

Volume = 530.14 cubic feet

1 cubic foot = 7.48 gallons

Pool = 3965.75 gallons, if filled to the brim

Pool = 4000 gallons in round numbers (minus 1% or so)