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.
Calculated pond turnover
Required delivered flow
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.