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

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.

Chemical Engineering

Reynolds Number Calculator

Compute the Reynolds number Re = ρvD/μ — the dimensionless ratio of inertial to viscous forces in a flowing fluid. The single most important number for predicting laminar vs turbulent flow in pipes, channels, and around objects.

Fluid Density (kg/m³)

Flow Velocity (m/s)

Pipe Diameter (m)

Dynamic Viscosity (Pa·s)

Fill in the required fields to see your result.

Key differences

	Pump NPSH Calculator	Reynolds Number Calculator
Category	Chemical Engineering	Chemical Engineering
Inputs required	5	4
Result	NPSH Available (m)	Reynolds Number
What it does	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.	Compute the Reynolds number Re = ρvD/μ — the dimensionless ratio of inertial to viscous forces in a flowing fluid. The single most important number for predicting laminar vs turbulent flow in pipes, channels, and around objects.