Round Pool Volume Calculator
The round pool volume calculator finds water volume and filling cost for round and oval pools with flat or sloped bottoms.
Water volume7,614 US gallons28,823 litres · 1,017.9 cu ft
Surface area254.47 sq ft23.641 m²
Average depth4 ft4 ft to 4 ft
Weight of the water31.77 US tons28,823 kg
Pump flow for a 8-hour turnover15.86 gal/min60 l/min
Filter area needed1.06 sq ftsand filters run about 15 gal/min per sq ft
Chlorine to raise by 1 ppm1.02 ozof pure chlorine, by weight
Volume in 10,000-gallon units0.761most pool chemicals are dosed per 10,000 gallons
Time to fill at 10 gal/min12:41a typical garden hose
The method
volume = area × average depth
Average depth, not maximum
A pool that runs from 3 to 8 feet averages 5½ feet, so it holds about a third less than the deep end suggests. Getting this wrong throws off every chemical dose, because they are all quoted per volume.
Freeform pools never fill their bounding rectangle. Taking 85% of length × width is the usual approximation for a kidney shape, and it is worth checking against the actual fill volume once you know it.
Turnover is the figure the plant is sized on: most codes want the entire volume passed through the filter in six to eight hours, which for a typical residential pool means 40–60 gallons a minute.