Friction Factor Calculator
Calculate Darcy friction factor using multiple methods
Input Parameters
Flow Regime Criteria:
• Laminar: Re < 2,300
• Transitional: 2,300 - 4,000
• Turbulent: Re > 4,000
Friction Factor Results
Darcy Friction Factor (f)
0.020120
Method: Colebrook-White (iterative)
Flow Analysis
Flow Regime:Turbulent (High)Roughness Class:Transitional RoughnessRelative Roughness:0.000450
Alternative Friction Factors
Darcy (f):0.020120Fanning (f/4):0.005030
Head Loss @ 5 ft/s
Head Loss/100ft:2.343 ftPressure Drop:1.0144 psi
Colebrook-White Equation:
1/√f = -2·log₁₀(ε/3.7D + 2.51/Re√f)
Where ε = roughness, D = diameter, Re = Reynolds number
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.