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Pond Turnover Calculator

Free Calculator

Calculate koi pond turnover rate

Use actual delivered pump flow to calculate turnovers per hour and minutes per turnover, or work backward from a desired turnover time to calculate the required flow.

1. Pond volume

Don't know it? Calculate pond volume first.

2. What do you want to calculate?

Use flow delivered at the pond after head loss, not the pump's zero-head rating.

min

Calculated pond turnover

0× per hour
One turnover every 0 minutes

Required delivered flow

0 GPH
0 liters/hour
Pond volume0
Delivered flow0
Turnovers per day0

Turnover rate describes circulation volume, not filtration effectiveness. Real pond performance also depends on where water is drawn from and returned, filter capacity, bypasses, dead zones, and actual measured flow.

Turnover formulas

turnovers per hour = delivered flow per hour ÷ pond volume

minutes per turnover = 60 ÷ turnovers per hour

required flow = pond volume × 60 ÷ desired turnover minutes

Calculator note

Use actual delivered flow whenever possible. Pump labels often state flow at little or no head, while installed flow can be lower because of vertical lift, pipe friction, fittings, and filtration equipment.

Pond Pump Size CalculatorPond Volume CalculatorPond filtration guide

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