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Pressure Drop Calculator

Calculate pipe pressure drop using Darcy-Weisbach equation

Input Parameters

Pipe Inner Diameter (mm)

Pipe Length (m)

Flow Rate (m³/h)

Fluid Density (kg/m³)

Fluid Viscosity (cP)

Fittings K-Factor Sum

Pipe Roughness (mm)

Darcy-Weisbach Equation:

ΔP = f × (L/D) × (ρv²/2)

Reynolds Number:

Re = ρvD / μ

Colebrook-White Equation:

1/√f = -2 log₁₀(ε/3.7D + 2.51/(Re√f))

Laminar Re < 2300 | Transitional 2300 ≤ Re < 4000 | Turbulent Re ≥ 4000