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Colebrook-White Friction Factor
Iterate the Darcy friction factor from Reynolds number and relative roughness.
visual calculatorInternal Flow & Losses
Read the flow shape before trusting the number.
This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.
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pipe flowfriction factorColebrookroughness
formula
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1/sqrt(f) = -2 log10(epsilon/(3.7D) + 2.51/(Re sqrt(f)))Darcy f
0.01851
regime
turbulent
Uses laminar f = 64/Re below Re = 2300 and Colebrook-White iteration above transition.