Pipe Pressure Drop Calculator

Calculate pipe friction pressure drop using the Darcy-Weisbach equation with Swamee-Jain friction factor. Handles laminar, transition, and turbulent flow regimes.

Inputs

Volumetric flow rate (m³/hr)

Pipe inner diameter (mm)

Pipe length (m)

Pipe roughness ε (mm)

Fluid density (kg/m³)

Dynamic viscosity (Pa·s)

Tab to move between fields

Results

Pressure drop (kPa)

1.49

Flow velocity (m/s)

0.35

Pressure drop (bar)0.01

Pressure drop (psi)0.22

Reynolds number35,297

Darcy friction factor0.02

Head loss (m)0.15

Velocity head (m)0.01

Flow RegimeTurbulent

How to Use This Calculator

Enter Volumetric flow rate (m³/hr), Pipe inner diameter (mm), and Pipe length (m).
Set Pipe roughness ε (mm), Fluid density (kg/m³), and Dynamic viscosity (Pa·s).
Review Pressure drop (kPa) and Flow velocity (m/s).
Use Pressure drop (bar) and Pressure drop (psi) to inform your decision.

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