Pipe Flow Rate Calculator

Calculate fluid flow rates and velocities in pipes

Pipe Diameter (mm)

Pipe Length (m)

Pressure Drop (kPa)

Fluid Viscosity (cP)

Fluid Density (kg/m³)

Pipe Roughness (mm)

How to Use

Required Information

Pipe Dimensions:
Internal diameter and length of the pipe
Pressure Drop:
Pressure difference between pipe ends

Common Values

Water Properties:
Viscosity: 1.0 cP
Density: 1000 kg/m³
Pipe Roughness:
PVC: 0.0015 mm
Steel: 0.045 mm