Darcy-Weisbach Pipe Flow Calculator – Friction Loss & Flow Rate

Darcy-Weisbach Pipe Flow Calculator

Calculate friction head loss (m), velocity (m/s), or discharge (m³/s) in circular pipes using the Darcy-Weisbach equation with Swamee‑Jain friction factor.

📏 What do you want to calculate? Head loss (given Q, D, L) Discharge (given hf, D, L)

Result will appear here

💡 Friction factor f computed via Swamee‑Jain (turbulent, 10⁻⁶ ≤ ε/D ≤ 10⁻², 5000 ≤ Re ≤ 10⁸). Water viscosity 1e‑6 m²/s at 20°C.