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Moody Chart Friction Factor Turbulent Flow Calculator

Swamee-Jain: f = 0.25/[log(ε/3.7D + 5.74/Re⁰·⁹)]².

Calculates the Darcy-Weisbach friction factor using the Swamee-Jain explicit approximation to the Colebrook-White equation for turbulent pipe flow.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

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  1. Fill in the inputs above using the units you already have.
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  3. Hover any result row for the underlying formula and intermediate values.

Formula

f = 0.25 / [log₁₀(ε/(3.7D) + 5.74/Re⁰·⁹)]²

In depth

Calculates the Darcy-Weisbach friction factor using the Swamee-Jain explicit approximation to the Colebrook-White equation for turbulent pipe flow.