Formula & worked example
TDH=Δz+ΔP/(ρg)+hf+Δ(v²/2g).
A system with 20 m static rise, 8 m pressure head and 12 m losses needs about 40 m TDH before velocity correction.
Plant engineering calculator · Updated Sep 17, 2026
Pump Total Dynamic Head Calculator — Static, Pressure, Friction & Velocity Head
Calculate pump TDH by combining elevation, vessel-pressure difference, suction/discharge friction and velocity-head change with fluid specific gravity.
Inputs
Live engineering result
Static head 20 m
Pressure head 20.394324 m
Velocity-head change 0.15295743 m
Friction head 12 m
Total dynamic head 52.547282 m
Equivalent pressure 515.3128 kPa
Assumptions & limits
- Use gauge-pressure difference consistently.
- Friction losses should be evaluated at the same design flow as the TDH point.
Frequently asked questions
What does this Pump Total Dynamic Head Calculator calculate?
Calculate pump TDH by combining elevation, vessel-pressure difference, suction/discharge friction and velocity-head change with fluid specific gravity.
Can I use the result for equipment selection?
Use the result as an engineering screening and cross-check. Confirm final selections against manufacturer performance data, design conditions, applicable standards and local code.
Why does MAXScanner show assumptions?
Plant calculations can move materially with pressure, temperature, fluid properties, diversity and operating conditions. Visible assumptions make the result auditable.