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

Pipe Pressure Drop Calculator

Compute the friction term f·(L/D)·(v²/2) from the Darcy-Weisbach equation — the specific energy loss per unit mass of fluid flowing through a straight pipe. Multiply by fluid density to get pressure drop in Pa, or divide by g for head loss in metres.

Friction Factor

Pipe Length (m)

Pipe Diameter (m)

Fluid Velocity (m/s)

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

	Pipe Pressure Drop Calculator	Reynolds Number Calculator
Category	Chemical Engineering	Chemical Engineering
Inputs required	4	4
Result	Pressure Drop (m)	Reynolds Number
What it does	Compute the friction term f·(L/D)·(v²/2) from the Darcy-Weisbach equation — the specific energy loss per unit mass of fluid flowing through a straight pipe. Multiply by fluid density to get pressure drop in Pa, or divide by g for head loss in metres.	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.