Pump Power Formula
Pump power represents the mechanical or electrical energy required to move fluid through a hydraulic system. It depends on the flow rate of the fluid, the head (height) the fluid must be lifted, and the efficiency of the pump.
Pump Power Formula
Pump Power (kW) = (Flow Rate × Head × Density × Gravity) / (Efficiency × 1000)
Formula Explanation
- Flow Rate – Volume of fluid moved by the pump per unit time.
- Head – Vertical distance the fluid must be lifted.
- Density – Density of the fluid (for water typically 1000 kg/m³).
- Gravity – Acceleration due to gravity (9.81 m/s²).
- Efficiency – Pump efficiency expressed as a decimal.
Example Calculation
If a pump delivers water at 50 m³/h with a head of 20 meters and efficiency of 70%:
Pump Power ≈ 3.9 kW
This means the pump requires approximately 3.9 kilowatts of power to operate under these conditions.
Use the Pump Power Calculator
You can estimate pump power instantly using our calculator.
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