basic

Darcy-Weisbach Friction Head Loss Calculator

hf = f × L/D × v²/(2g) — friction loss in pipe flow.

Calculates friction head loss in a pipe from Darcy friction factor, pipe length, diameter, and flow velocity.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

hf = f × (L/D) × v²/(2g); f from Moody chart

In depth

Calculates friction head loss in a pipe from Darcy friction factor, pipe length, diameter, and flow velocity.