EngineeringToolkit

Darcy-Weisbach Equation (Hydraulics) Formula

Calculates head loss due to friction in pipe flow.

Formula

hf = f × (L/D) × (V²/2g)

Discipline: Hydraulics. Result unit: m.

Variables and units

  • hf — Head Loss (m): Friction head loss
  • f — Friction Factor: Darcy friction factor
  • L — Length (m): Pipe length
  • D — Diameter (m): Pipe diameter
  • V — Velocity (m/s): Flow velocity
  • g — Gravity (m/s²): Gravitational acceleration