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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

Friction Factor Calculator

Find the Darcy-Weisbach friction factor for laminar or turbulent pipe flow from the Reynolds number and pipe roughness. Essential for calculating head loss in piping system designs.

Reynolds Number

Relative Roughness

Pipe Condition

Temperature Factor

Flow Regime

Key differences

	Darcy-Weisbach Pressure Loss Calculator	Friction Factor Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	4	5
Result	Pressure Loss per Unit Density (m²/s²)	Friction Factor
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.	Find the Darcy-Weisbach friction factor for laminar or turbulent pipe flow from the Reynolds number and pipe roughness. Essential for calculating head loss in piping system designs.