Pump Power Calculator
This Pump Power Calculator computes hydraulic (water) power and required pump (shaft) power from flow rate and total head — accounting for pump efficiency and fluid density. Ideal for mechanical and process engineers, technicians, and students who need fast, accurate sizing and cost estimates.
Flow & Head → kW
Enter Flow Rate in m³/h.
Enter Total Head (m). This should include static lift, friction losses, and minor losses.
Enter Pump Efficiency (%) (or leave blank for default 75%).
(Optional) Enter Fluid Density (kg/m³), default = 1000 for water.
Click Calculate. Results appear immediately (hydraulic power, pump shaft power, suggested motor size).
🧭 How to Use
FAQ
Q1. Does this include motor & transmission losses?
A. No — this calculator gives hydraulic power and shaft power. Add allowances for motor inefficiencies and driveline losses when selecting final motor.
Q2. What should be included in Total Head?
A. Sum of static lift, frictional losses in piping, and minor losses (valves, fittings). Use a separate pressure-drop calculator for piping losses.
Q3. What units should I use?
A. Flow in m³/h, head in meters, density in kg/m³, efficiency in percent.
Q4. How accurate is the suggested motor size?
A. The suggestion rounds the calculated shaft power up to common motor sizes — confirm final motor selection with manufacturer data and service factors.