Quickly calculate the Total Dynamic Head (TDH) for your system. Enter your pipe details, flow rate and head differential, to see the combined static and friction losses your pump must overcome.
Total Dynamic Head Calculator
Tip: choose the unit you work in.
Water at ~20 °C ≈ 1.0 cSt.
Pipe & Roughness
Edit if using "Custom".
If entered, overrides SDR calc.
If an internal diameter is entered, the widget will use it directly. Otherwise ID is calculated from OD and SDR: ID = OD × (1 − 2/SDR).
Fittings (counts)
Advanced: adjust K-values
All minor losses use h = K · v²/(2g) at the section velocity.
Results
Internal diameter
— mm
Velocity
— m/s
Reynolds number
—
Friction factor (Darcy)
—
Major head loss
— m
Minor head loss
— m
Dynamic head (friction)
— m
Total head (static + dynamic)
— m
Uses Darcy–Weisbach with Haaland friction approximation; g = 9.81 m/s². Laminar cut-over uses f = 64/Re.
Disclaimer: This tool provides engineering estimates for clean liquids in full pipes. Real systems may differ due to fittings not listed, entrance/exit losses, air/gas content, non-Newtonian fluids, misalignment, or partial blockage. Use engineering judgement and verify against actual site conditions.
