Enter Re and ε/D to plot your operating point. Friction factor from Colebrook-White equation. Hover over the chart to read values.
Turbulent friction factors computed by Colebrook-White equation (iterative, converges in <10 iterations). Laminar: f = 64/Re.
Darcy–Weisbach: h_L = f × (L/D) × V²/(2g). Some texts use Fanning f = f_Darcy/4 — always confirm which convention is used.