Pool Pump Run Time Calculator

Divide your pool volume in gallons by the pump flow rate in gallons per hour (GPH) to get the hours for one full turnover. Multiply that by your daily turnover target. For example, a 20,000 gallon pool with a 3,600 GPH pump needs about 5.6 hours for one turnover per day. Two turnovers would need roughly 11.1 hours.

A turnover is the time it takes the pump and filter to circulate a volume of water equal to your entire pool. This calculator multiplies that time by the daily turnover target you choose. The target is a planning input, not a universal water-quality or operating requirement. Follow local rules and your pool professional's advice for your system.

Pump and filter specs are often listed in gallons per minute (GPM). Multiply GPM by 60 to get gallons per hour, so a 50 GPM pump moves 3,000 GPH. Your real flow is usually lower than the label because of plumbing length, fittings, and filter resistance (head loss), so treat the rated number as a best case.

The calculator divides your pool volume by the flow rate you enter, then multiplies by your turnover target. It does not prescribe a universal daily schedule. If the result is impractical, verify the actual system flow and get local operating guidance before changing the run time.

Yes. Enter your pump power in watts and your electricity rate in dollars per kWh to estimate daily and monthly cost. Daily energy is the pump kilowatts multiplied by the run hours, and monthly cost uses an average month of about 30.44 days. Variable-speed pumps move more water per watt at low speeds, so longer run times at a lower speed can cost less than short bursts at full speed.

Yes. The total daily hours can be divided into two or more cycles across the day, such as morning and evening, and still deliver the same number of turnovers. Splitting cycles helps keep water moving and can line up with off-peak electricity rates. The total run time you need stays the same.