// multi-utility computation suite · offline · instant · precise
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eng.pump-specific-speed-Ns Calculator
Calculates pump specific speed from flow rate, head, and RPM to determine the optimal impeller type (radial, mixed flow, or axial). Specific speed Ns = N√Q / H^(3/4) — radial flow impellers for Ns < 2,000; mixed flow for 2,000–5,000; axial flow for Ns > 5,000.
Inputs
N Rpm
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Q M3 S
Volume of fluid per unit time. Used to size pipes, pumps, and ducts.
H M
Reference formula or conversion factor shown for context.
Results
specific speed Ns (SI, metric)
The computed rate of movement or processing.
specific speed Ns (US customary)
The computed rate of movement or processing.
pump type classification
Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.
Ns = N·√Q / H^0.75
Sample size or count used in the calculation.
efficiency peak
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.