How many gallons is a 21 ft round pool

Frequently asked questions

kind of, what if the pool depth varies?The calculation above assumes a uniform depth. If the pool has varying depths, you'll need to calculate the volume for each segment, then sum them up to get the total volume.
How does the shape of the pool affect the calculation?The method above is suitable for a standard circular pool with a uniform shape and depth.
Can I use this for other pool shapes?This calculation is specific to round pools. Different pool shapes (oval, rectangular, etc.) will require different volume formulas.

anyway, using the formula and the assumed depth:

Volume = π (10.5 feet)² 5 feet ≈ 1731 cubic feet

by the way, now we need to convert cubic feet to gallons. There are approximately 7.48 gallons per cubic foot.

Gallons ≈ 1731 cubic feet 7.48 gallons/cubic foot ≈ 12,960 gallons

Therefore, a 21-foot round pool with an average depth of 5 feet is approximately 12,960 gallons.

sort of, a round pool can be considered a cylinder. sort of, the formula for the volume of cylinder is: π radius² height. — more or less

Assuming a standard pool depth, we need to know the average depth of the pool. — I mean

Let's assume an average depth of 5 feet.