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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

Darcy-Weisbach Pressure Drop Calculator

Calculates pressure drop along a pipe section using the Darcy-Weisbach equation. Used by engineers designing water supply, HVAC, and industrial piping systems to size pipes and pumps correctly.

Friction Factor

Pipe Length (m)

Pipe Diameter (m)

Flow Velocity (m/s)

Fluid Density (kg/m³)

Key differences

	Darcy-Weisbach Pressure Loss Calculator	Darcy-Weisbach Pressure Drop Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	4	5
Result	Pressure Loss per Unit Density (m²/s²)	Pressure Drop (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.	Calculates pressure drop along a pipe section using the Darcy-Weisbach equation. Used by engineers designing water supply, HVAC, and industrial piping systems to size pipes and pumps correctly.