🔵 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
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. Bear in mind that a pump's rated GPM is measured with no resistance — real flow through your plumbing, filter, and fittings is lower, so size up slightly, or choose a variable-speed pump you can dial 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.