Pump Horsepower Calculator
Estimate pump power from flow, total dynamic head, and pump efficiency.
Pump Horsepower Calculator
Estimate water horsepower, brake horsepower, and approximate power demand for pump planning.
What this calculator includes
The calculator estimates water horsepower and brake horsepower or kilowatts based on flow, head, and efficiency. It does not size motors, check NPSH, pump curves, controls, or operating points.
Use pump curves and manufacturer data before selecting actual equipment.
What this calculator does
This tool estimates water horsepower, brake horsepower, and approximate kilowatt demand using flow, total dynamic head, and efficiency.
Inputs explained
- Flow rate: The amount of water moved by the pump.
- Total dynamic head: Static lift plus friction losses and discharge pressure.
- Pump efficiency: Expected efficiency of the pump and drive system.
Limitations
This does not select a pump. Final selection should check pump curves, system curve, motor size, NPSH, submergence, controls, duty point, and operating range.
FAQ
What is total dynamic head?
Total dynamic head is the total head the pump must overcome, including elevation difference, pressure requirement, and friction losses.
What is the difference between water horsepower and brake horsepower?
Water horsepower is power delivered to water. Brake horsepower is the power required at the pump shaft after efficiency losses.
Can this pick a pump model?
No. Use manufacturer pump curves and operating conditions to select a pump model.
Should I add a safety factor?
Motor sizing and safety factors should follow manufacturer guidance and project requirements.
Related tools
Need help reviewing this result?
Use this calculator for planning-level checks, then request help if you need a second look at assumptions, units, stormwater criteria, pump sizing, storage volume, or report-ready calculations.