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Both calculators run independently — change the inputs on either side to compare results.

Pump Power and Efficiency Calculator

Calculates the shaft power a pump must deliver to move fluid against a given head, accounting for pump efficiency. Used when selecting pumps for water supply, irrigation, HVAC, and industrial process systems.

Flow Rate (m³/s)

Total Head (m)

Fluid Density (kg/m³)

Pump Efficiency (%)

Fill in the required fields to see your result.

Fluid Mechanics

Pipe Flow Reynolds Number Calculator

Computes the Reynolds number for flow inside a pipe to classify the flow as laminar, transitional, or turbulent. Essential for friction factor selection, heat transfer design, and mixing analysis.

Fluid Velocity (m/s)

Pipe Diameter (m)

Fluid Density (kg/m³)

Dynamic Viscosity (Pa·s)

Fill in the required fields to see your result.

Key differences

	Pump Power and Efficiency Calculator	Pipe Flow Reynolds Number Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	4	4
Result	Required Power (kW)	Reynolds Number
What it does	Calculates the shaft power a pump must deliver to move fluid against a given head, accounting for pump efficiency. Used when selecting pumps for water supply, irrigation, HVAC, and industrial process systems.	Computes the Reynolds number for flow inside a pipe to classify the flow as laminar, transitional, or turbulent. Essential for friction factor selection, heat transfer design, and mixing analysis.