How does the Pipe Sizing Calculator work?

Apply Hazen-Williams or Darcy-Weisbach equations Then: Velocity typically 0.6-2.4 m/s for water systems Then: Calculate diameter and pressure drop.

Can you give an example of how to use the Pipe Sizing Calculator?

Example: Input Q = 0.05 m³/s water flow, C = 150 (PVC), L = 100 m gives a result of D ≈ 50-63 mm for <1 m/100 m drop (Hazen-Williams estimate).

Is the Pipe Sizing 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 Pipe Sizing Calculator?

Our Pipe Sizing 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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Pipe Sizing Calculator

Flow Rate (ft³/s)

Desired Velocity (ft/s)

Pipe sizing selects appropriate diameter to convey water at acceptable velocity and pressure drop. Too small causes excessive friction; too large wastes material.

Difficulty:intermediate

References

›Pipe Sizing — Wikipedia

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Pipe Sizing Calculator

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Pipe Sizing Calculator