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Darcy-Weisbach Pressure Loss Calculator

Compute friction pressure loss in a pipe using the Darcy-Weisbach equation, the rigorous standard for all Newtonian fluids and flow regimes. Useful for pump sizing, pipe sizing decisions, and verifying pressure budgets in process and HVAC systems.

Friction Factor

Pipe Length (m)

Pipe Diameter (m)

Flow Velocity (m/s)

Fluid Mechanics

Pipe Friction Loss Calculator

Estimate the pressure head lost to friction in any pipe system using the Darcy-Weisbach equation. Use it when designing water supply lines, irrigation networks, or HVAC piping to ensure adequate flow pressure.

Flow Rate (L/min)

Pipe Diameter (mm)

Pipe Length (m)

Fluid Density (kg/m³)

Key differences

	Darcy-Weisbach Pressure Loss Calculator	Pipe Friction Loss Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	4	4
Result	Pressure Loss per Unit Density (m²/s²)	Pressure Loss (Pa)
What it does	Compute friction pressure loss in a pipe using the Darcy-Weisbach equation, the rigorous standard for all Newtonian fluids and flow regimes. Useful for pump sizing, pipe sizing decisions, and verifying pressure budgets in process and HVAC systems.	Estimate the pressure head lost to friction in any pipe system using the Darcy-Weisbach equation. Use it when designing water supply lines, irrigation networks, or HVAC piping to ensure adequate flow pressure.