🔵 Pump Turnover Calculator
Enter your pool volume plus a target turnover time or your pump's flow rate — the tool fills in the other, so you can size a pump or set how long to run it each day.
💧 Circulate the Whole Pool
Pool safety comes first
- Fence the pool on all four sides, at least 4 feet high and not climbable, with a self-closing, self-latching gate (Pool Safely, CPSC). A fence all the way round is better than using the house as the fourth side.
- Always watch children in or near the water and never leave them unattended; name one adult as the Water Watcher (Pool Safely).
- Drain covers should meet the federal safety standard behind the Virginia Graeme Baker Pool & Spa Safety Act (public pools and spas must have them); powerful drain suction can trap a swimmer underwater. Replace a broken or missing cover before anyone swims.
- Pumps, heaters and other pool equipment need GFCI protection, and an electrician qualified in pool and spa work should install and inspect them (CPSC).
What is a Pump Turnover Calculator?
It links three things — your pool's volume, your pump's flow rate in gallons per minute, and the turnover time. Give it a target turnover time and it returns the flow rate you need; give it a pump's flow rate and it returns how long one full turnover takes. Enter both to check them against each other.
Turnover is the heartbeat of pool care: clean, balanced water depends on moving the whole volume through the filter regularly. Use this to choose a pump, decide your daily run time, or confirm your current setup is keeping up — and remember real-world flow is a little lower than the numbers suggest.
❓ Frequently Asked Questions
What is pool turnover and why does it matter?
Turnover is the time it takes your pump and filter to circulate a volume of water equal to the entire pool once. Good circulation is what carries water through the filter and distributes chemicals evenly — poor turnover leaves dead spots where algae and cloudiness start. Most pools should turn over at least once every 24 hours.
How many hours a day should I run the pump?
A common target is one to two full turnovers per day, which for many residential pools works out to roughly 8 hours of running time — but it depends on your pump's flow rate and pool size, which is exactly what this calculator sorts out. In hot weather or heavy use, run it longer.
What flow rate should I look for in a pump?
Enter your volume and a target turnover time (say 8 hours) to get the GPM your pump must move. A pump moves less water the more resistance (head) its plumbing, filter and fittings add, so read the flow off the pump's performance curve at your system's head rather than the biggest number on the box. A bigger pump is not automatically the answer: it costs more to run, and a variable-speed pump can be dialed in.
Is running the pump longer at low speed better?
Usually, yes. A variable-speed pump running longer at a lower speed moves the same total water far more efficiently than a single-speed pump running flat out for a few hours — often cutting energy use dramatically while giving gentler, more thorough turnover. Aim for continuous, quieter circulation rather than short bursts.