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    Sprinkler Friction Loss Calculator (Hazen-Williams)

    Which C-factor should I use for fire sprinkler pipe?

    Use the project or standard-specified value. Typical first-pass values are around 120 for steel, 140 for ductile iron, and 150 for CPVC/plastic. Always match the value required by your design basis and AHJ expectations.

    Run the numbers for your project

    Use the Sprinkler Friction Loss Calculator (Hazen-Williams) to get an exact answer for your inputs.

    Open the calculator

    Related questions

    Estimates and general guidance only. Verify against your local code and AHJ before any installation. Gas, electrical, and refrigerant work is hazardous to untrained users.

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