Darcy-Weisbach Head Loss Calculator

Enter 0 for smooth pipe, or specific value (steel: 0.045mm, PVC: 0.0015mm, concrete: 0.3mm)
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What This Calculator Does

The Darcy-Weisbach equation calculates frictional head loss in pipes based on flow velocity, pipe characteristics, and fluid properties.

Key Points:
  • Standard: ISO 5167, ASME B31.1, EN 13480
  • Fluid: Water at 20°C (ν = 1×10⁻⁶ m²/s)
  • Valid for: Incompressible fluids, Re > 4000 (turbulent)
  • Roughness values: PVC (0.001mm), Steel (0.045mm), Concrete (0.3-3mm)
  • Temperature range: 0-40°C (viscosity corrected)
  • Automatically calculates Reynolds number and flow regime
  • Determines friction factor using Colebrook-White or theoretical laminar formula
  • Essential for pump sizing and system pressure calculations
Calculation Steps:
  1. Enter all required parameters
  2. Click "Update Calculation"
  3. Review results and analysis
Formula Variables:
hf Head Loss (m)
V Velocity (m/s)
Re Reynolds Number ()
f Friction Factor ()
L Pipe Length (m)
D Pipe Diameter (mm)