Pump Power Calculator
Hydraulic and shaft power needed to pump water.
L/s
m
%
$/kWh
How it works
Hydraulic power (kW) = 9.81 × flow (L/s) × head (m) ÷ 1000 for water. Shaft power = hydraulic power ÷ pump efficiency. Motor losses come on top, so choose a motor somewhat larger than the shaft power. Head includes lift plus friction losses in the pipes. Example: with the default values, shaft power needed comes to 1.51 kW.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.