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Pipe Flow & Pressure Drop Calculator

Calculate flow velocity, Reynolds number, friction factor (Colebrook-White / Moody), and pressure drop using the Darcy-Weisbach equation. Supports 7 fluids and 7 pipe materials.

Input Parameters

Fluid

Pipe Material

Pipe Inner Diameter (D) (mm)

Pipe Length (L) (m)

Flow Rate (Q) (L/min)

Results

Flow Rate (Q)	100.000 L/min = 6.0000 m³/h
Flow Velocity (V)	0.849 m/s
Reynolds Number (Re)	42280
Flow Regime	Turbulent
Darcy Friction Factor (f)	0.02179
Pressure Drop (ΔP)	15.674 kPa = 0.1567 bar
Velocity Head	0.360 kPa
Pipe CSA (A)	1963.495 mm²

Method:Darcy-Weisbach equation with Colebrook-White friction factor (iterative). Minor losses (fittings, bends) not included — add a safety factor of 20–30% for real systems. For laminar flow (Re < 2300), f = 64/Re (Hagen-Poiseuille).