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Pump Power Calculator

Calculate the shaft power required to pump a fluid against a given head, accounting for flow rate, fluid density, and pump efficiency. Use it when sizing motors and selecting pumps for water, oil, or chemical service.

Volumetric Flow Rate (m³/s)

Total Head (m)

Pump Efficiency

Fluid Density (kg/m³)

Fill in the required fields to see your result.

Chemical Engineering

Pump NPSH Calculator

Calculates the Net Positive Suction Head available (NPSHa) for a centrifugal pump installation to verify cavitation will not occur. Use it whenever sizing pump suction lines or repositioning a pump relative to its fluid source.

Atmospheric Pressure (Pa)

Vapor Pressure at Pumping Temperature (Pa)

Static Suction Head (m)

Suction Line Friction Losses (m)

Fluid Density (kg/m³)

Fill in the required fields to see your result.

Key differences

	Pump Power Calculator	Pump NPSH Calculator
Category	Chemical Engineering	Chemical Engineering
Inputs required	4	5
Result	Power Requirement (kW)	NPSH Available (m)
What it does	Calculate the shaft power required to pump a fluid against a given head, accounting for flow rate, fluid density, and pump efficiency. Use it when sizing motors and selecting pumps for water, oil, or chemical service.	Calculates the Net Positive Suction Head available (NPSHa) for a centrifugal pump installation to verify cavitation will not occur. Use it whenever sizing pump suction lines or repositioning a pump relative to its fluid source.