Darcy Weisbach Calculator

Created by Luis Fernando
Last updated: Jun 24, 2022
The equation states that the pressure loss ΔP=fLρV²/2D (where L and D are th pipe length and diameter, ρ is the fluid density, V is the average velocity through the pipe, and f is the Darcy friction factor). Head loss is also available through the unit menus.
Luis Fernando
Pipe with Length, L, diameter, D, and fluid pressures P1 and P2 on either ends.
Pipe length (L)
ft
Pipe diameter (D)
ft
Flow velocity (V)
ft/s
Density of fluid (ρ)
lb/cu ft
Darcy friction factor (f)
Pressure drop (ΔP)
psi
To calculate Darcy friction factor (f), try our dedicated friction factor calculator, that uses Moody approximation for Colebrook equation.
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