Welcome to the Pump kW Power Calculator — your go-to tool for sizing and assessing pump shaft power with precision. Whether you’re engineering a system, specifying a motor, or validating an installation, this calculator simplifies the process by translating your pump’s performance data into meaningful power requirements.
Pump kW Power Calculator
Hydraulic power, shaft power, and suggested motor sizing.
Inputs
Enter a flow rate > 0.
Static + friction + other system losses.
Enter a head > 0.
Water ≈ 1.00 at ~20 °C.
Enter SG > 0 (e.g., 1.05).
Overall efficiency at duty point.
Enter efficiency between 1 and 100%.
Applied to pump shaft kW.
Shows estimated electrical input kW.
Results
Hydraulic Power
–
kW
Shaft Power (Pump)
–
kW
Suggested Motor Size
–
kW (with margin)
Horsepower (mechanical)
–
HP
HP (metric)
–
PS
Assumes steady-state operation and neglects drive/gear losses. Verify against the pump curve at the duty point.
© The Pump Expert — Guidance only.
v1.1
Note: The results are provided for guidance only. Actual duty conditions, drive losses, system curve variations and installation factors must be verified using the pump curve and manufacturer data.