Pump Energy Calculator


In the realm of engineering and physics, understanding the energy requirements of pumps is crucial for designing efficient systems. A pump energy calculator simplifies this process by providing a tool to compute the energy needed to power a pump accurately.

How to Use:

To utilize the pump energy calculator, input the required parameters such as flow rate (Q), total head (H), and pump efficiency (η) into their respective fields. Then, click the “Calculate” button to obtain the energy consumption.


The formula used for calculating the energy consumption of a pump is:


  • P = Power (W)
  • ρ = Density of the fluid (kg/m³)
  • g = Acceleration due to gravity (m/s²)
  • Q = Flow rate (m³/s)
  • H = Total head (m)
  • η = Pump efficiency (%)

Example Solve:

Let’s assume:

  • ρ=1000 kg/m³
  • g=9.81 m/s²
  • Q=0.05 m³/s
  • H=20 m
  • η=80%

Using the formula:

So, the power required for the pump is approximately 123.04 Watts.


Q: What units should I use for input parameters?

A: Ensure consistency with units, typically meters for lengths and seconds for time-related parameters.

Q: Why is pump efficiency essential in the calculation?

A: Pump efficiency accounts for losses in the system, providing a more accurate representation of energy consumption.

Q: Can this calculator handle different fluid densities?

A: Yes, simply input the appropriate density value for the fluid being pumped.


The pump energy calculator is a valuable tool for engineers and designers in assessing the energy requirements for pump systems accurately. By considering factors such as flow rate, total head, and pump efficiency, it provides insights crucial for optimizing energy usage in various applications.

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