Pool Pump Run Time & Turnover Calculator

How this is calculated

• Turnover hours = pool gallons / (flow rate in GPM x 60).
• Target one full turnover per day in season, with a practical floor of about 6 hours so skimming and chemical distribution still happen.
• Typical flow rates: 40 to 60 GPM for a residential single-speed pump on high, and 20 to 35 GPM for a variable-speed pump on an efficient low setting.
• Running a variable-speed pump slower for longer moves the same water for a fraction of the energy, because power draw falls roughly with the cube of speed.
• Cost = motor kW x hours x days x your rate per kWh. A 1.5 HP single-speed pump draws roughly 1.8 kW; the same pump at low speed on a VS motor can draw under 0.3 kW.

Figures follow commonly published residential pool references and are guidance, not a substitute for testing your own water. Always follow the product label and add one chemical at a time.

Frequently asked

How many hours a day should a pool pump run?

Long enough for one full turnover, which is typically 8 to 12 hours in season for a residential pool. Cutting below that saves power but leaves debris and dead spots the chemicals never reach.

Is it cheaper to run the pump at night?

Only if your utility has time-of-use rates. Chemically, some daytime run time is preferable so chlorine circulates during peak UV and heat, when demand is highest.

Is a variable-speed pump worth it?

In most cases yes: the same daily turnover at lower speed can cut pump energy by 50 to 80%, and many regions now require variable-speed motors on replacement installs. Payback commonly lands inside two seasons on a pool that runs year-round.

Do I need more run time after a storm or heavy use?

Yes. Add several hours of filtration after storms, parties or any shock treatment, and backwash or clean the filter when pressure rises 8 to 10 psi above its clean baseline.