Physics

Friction Loss Calculator

Find friction head loss in a pipe (Darcy–Weisbach).

Friction factor

Pipe length

Diameter

Velocity

Calculated Output

Friction head loss 6.881

Formula: h_f = f·(L/D)·(v² ÷ 2g)

Step-by-Step Breakdown

1. Values used:

2. Friction factor = 0.03

3. Pipe length = 100

4. Diameter = 0.05

5. Velocity = 1.5

7. Friction head loss = 6.881

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The math behind it

h_f = f·(L/D)·(v²/2g). It rises with length, velocity squared and friction factor.

f = 0.03, 100 m, 0.05 m dia, 1.5 m/s → about 6.88 m.

How to cut friction loss?

Use larger-diameter, smoother pipe and reduce flow velocity.