How does the Friction Loss Calculator work?

Hazen-Williams: hf = (10.67×L×Q^1.85) / (C^1.85×D^4.87) Then: Darcy-Weisbach: hf = f×(L/D)×(V²/2g) Then: Results show required head or fan power.

Can you give an example of how to use the Friction Loss Calculator?

Example: Input PVC pipe (C=150), Q=0.05 m³/s, D=50 mm, L=100 m gives a result of hf ≈ 10-12 m head loss (Significant energy requirement).

Is the Friction Loss Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Friction Loss Calculator?

Our Friction Loss Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Friction Loss Calculator

Friction Factor (f)

Pipe Length (ft)

Pipe Diameter (in)

Velocity (ft/s)

Friction loss (pressure drop) in pipes and ducts represents energy loss. It's critical for pump and fan sizing.

Symbol	Name	Unit	Description
L	L value	—	Variable used in the calculation
Q	Q value	—	Variable used in the calculation
C	C value	—	Variable used in the calculation
D	D value	—	Variable used in the calculation

Difficulty:intermediate

References

›Friction Loss — Wikipedia

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