Pressure Loss calculator

friction coefficient
length pipe/duct (m, ft)
hydr. diameter (m, in)
density (kg/m3, lb/ft3)
flow (m3/s, ft3/min)
Imperial units

The calculator to calculate the pressure loss in a pipe, duct or tube. The conditon is 20oC, 1.2 kg/m3 and 6 m/s.

The Darcy-Weisbach equation formula

Δp = λ (l / dh) (ρ v2 / 2)


λ = Darcy-Weisbach friction coefficient

dh = hydraulic diameter(m)

ρ = density (kg/m3)

l = length of duct or pipe (m)

Δp = pressure loss (Pa, N/m2) provides you helpful and handy calculator resources.