Darcy Friction Factor Calculator
Estimate the Darcy friction factor from Reynolds number (approx).
Input Data
Friction Factor
Pipe Length
m
Pipe Diameter
m
Velocity
m/s
Results
4.0775m
At a glance:For smooth turbulent pipe, f ≈ 0.316·Re⁻¹/⁴ (Blasius). Complements reynolds-number and darcy-weisbach.
Formula
f ≈ 0.316·Re^(−1/4).
$$h_f = f\,\dfrac{L}{D}\,\dfrac{v^2}{2g}$$How to Use
- Enter Reynolds and roughness.
- The tool returns the friction factor.
Case Studies
Re=1e5
f ≈ 0.0178.
FAQ
Laminar?
For Re<2000, f = 64/Re.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.