Pool Volume Calculator
Calculate how many gallons and liters of water your rectangular, round or oval pool holds. Example: a 16 by 32 foot rectangular pool with an average depth of 5 feet holds about 19,150 gallons.
Type the problems from this lesson and check each step.
Show steps
How to use the Pool Volume Calculator
- Choose the pool shape.
- Enter the length and width (or diameter) and the average depth.
- Press Calculate for gallons and liters.
Formula and method
Rectangle: length x width x average depth x 7.48 gallons per cubic foot. Round: pi x radius squared x depth x 7.48. Oval: pi / 4 x length x width x depth x 7.48.
Worked example: 16 x 32 ft, 5 ft average depth
| Step | Result |
|---|---|
| Cubic feet (16 x 32 x 5) | 2,560 |
| Gallons (2,560 x 7.48) | 19,150 |
| Liters | 72,490 |
Rectangular pool volume (gallons)
| Size | 4 ft avg | 5 ft avg | 6 ft avg |
|---|---|---|---|
| 12 x 24 ft | 8,618 | 10,772 | 12,926 |
| 16 x 32 ft | 15,320 | 19,150 | 22,980 |
| 18 x 36 ft | 19,390 | 24,237 | 29,084 |
| 20 x 40 ft | 23,938 | 29,922 | 35,906 |
Why volume matters
Pool chemicals, heaters and pumps are sized by volume. Knowing your gallons lets you dose chlorine, balance pH and size a heater correctly.
Frequently asked questions
How do I calculate pool volume?
Multiply length by width by average depth, then by 7.48 gallons per cubic foot.
How do I find the average depth?
Add the shallow and deep end depths and divide by 2.
How many gallons is a round pool?
Pi x radius squared x depth x 7.48.
How many gallons per cubic foot?
7.48.
How much does the water weigh?
About 8.34 pounds per gallon.
How long does it take to fill a pool?
Gallons divided by hose flow, often 5 to 10 gallons per minute.
Sources
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