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Pressure drop calculator

Estimate line pressure drop using Darcy-Weisbach friction factor, length, diameter, density, and velocity.

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Darcy friction factor f

Pipe length L (m)

Inside diameter D (m)

Fluid density ρ (kg/m³)

Velocity V (m/s)

Engineering note

kPa

bar

ΔP = f × (L / D) × (ρV² / 2)

If f = 0.02, L = 100 m, D = 0.1 m, ρ = 1000 kg/m³, and V = 2 m/s, pressure drop ≈ 40000 Pa.