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. Most residential pools are sized to turn the water over at least once per day. In hot weather, heavy use, or when fighting algae, two turnovers per day is a common target so the water passes through the filter twice.

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.

A common rule of thumb is 8 hours a day, but the right number depends on your pool volume and pump flow rate. This calculator gives the exact hours to reach one or two full turnovers instead of guessing. If your pump is undersized for the pool, the calculated run time will be longer than 8 hours.

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.