Pump Flow Rate Calculator
Flow, head and hydraulic power.
Enter your values
ⓘ Live results
Results
- Motor power required
- 4.04 kW
- Hydraulic power
- 2.83 kW
- Flow
- 43.2 m³/h
- Power in hp
- 5.41
Quick answer
Pump power depends on flow, total head, fluid density and efficiency.
Power = ρ × g × Q × H ÷ efficiency
How to use the Pump Flow Rate Calculator
- 1Enter the required flow rate.
- 2Enter total head including friction losses.
- 3Enter pump efficiency from the curve.
Worked example
Using the values the calculator loads with:
Inputs
- Flow rate12 L/s
- Total head24 m
- Pump efficiency70 %
- Fluid density1000 kg/m³
Results
- Motor power required4.04 kW
- Hydraulic power2.83 kW
- Flow43.2 m³/h
- Power in hp5.41
Frequently asked questions
What is total head?
Static lift plus friction and pressure head, not just the vertical rise.
What efficiency should I use?
60–80% for centrifugal pumps in typical duty.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.