Pool Volume Calculator

volume in cubic feet = surface area x average depth, and gallons = cubic feet x 7.48. Surface area depends on the shape. A rectangle is length x width. A circle is pi x radius squared. An oval is pi/4 x length x width, which is about 79 percent of the rectangle that would enclose it. Average depth is the shallow end plus the deep end, divided by two. That is exactly right for a floor that slopes at a constant rate from one end to the other. For a pool with a flat shallow section, a slope, and a flat deep section, it runs a few percent high, so it is a safe number for chemicals and a slightly generous one for the water bill. A kidney or freeform pool: measure the longest length and the widest width and treat it as an oval. You will be within about 10 percent, which is inside the tolerance of every chemical dose on the label.

How many gallons is a 16 by 32 pool?

About 21,500 gallons with an average depth of 5.75 feet, which is a 3.5 foot shallow end and an 8 foot deep end. If it has a flat 5 foot floor instead, it holds about 19,200.

How do I calculate the volume of a kidney shaped pool?

Treat it as an oval using the longest length and the widest width, so pi/4 times length times width times average depth. It comes out within roughly 10 percent, and every pool chemical is dosed in wider bands than that.

How long does it take to fill a pool with a garden hose?

A typical hose runs around 9 gallons a minute, so 20,000 gallons takes about 37 hours. Two hoses halve it. Check with your utility first, because a large fill can trip a leak alert or an excess use charge.

How much does it cost to fill a swimming pool?

Water itself is cheap: at $5 per 1,000 gallons a 20,000 gallon pool is about $100. The sewer portion of the bill is often the bigger charge, and many utilities will remove it for a pool fill if you call ahead.

Why do I need to know my pool volume exactly?

Every chemical is dosed per 10,000 gallons. Guessing 20,000 when the real number is 26,000 means chronically under-chlorinating, which is how an algae bloom starts. It is worth measuring the pool once and writing the number on the pump.

How many gallons is a round above ground pool?

A 24 foot round pool at 52 inches deep holds about 13,500 gallons. The depth to use is the water depth, not the wall height, since these pools are normally filled to about 6 inches below the top rail.