Free · formula-visible · US + metric

Pump Calculators

Free hydraulic and pump-sizing calculators — each shows its formula, its units, and a worked example. US and metric.

41 tools available No sign-up · no black-box answers

Power & Energy Horsepower Calculator — AC Three Phase Power Supply Analyze a three-phase AC motor circuit: horsepower, line-to-line voltage, efficiency, power factor, and line current. Enter any four… Open calculator Power & Energy Horsepower Calculator — AC Single Phase Power Supply Analyze a single-phase AC motor circuit: horsepower, voltage, efficiency, power factor, and current. Enter any four of the… Open calculator Hydraulics Suction Specific Speed Calculator (Nss) Find a centrifugal pump’s suction specific speed (Nss) from flow, NPSH required, and rotational speed at the best… Open calculator Hydraulics Suction Specific Speed Calculator (Nss) Find a centrifugal pump’s suction specific speed (Nss) from flow, NPSH required, and rotational speed at the best… Open calculator Hydraulics Pump Specific Speed Calculator (Ns) Find a centrifugal pump’s specific speed (Ns) from flow, head, and rotational speed at the best efficiency point… Open calculator Power & Energy Pump Efficiency Calculator (Electric Motor Driver) Determine a motor-driven centrifugal pump’s efficiency from motor power, discharge and suction pressure, flow, and motor efficiency. Enter… Open calculator Power & Energy Brake Horsepower Calculator Open calculator Applications Sump Pump Sizing Calculator Size a sump pump from your actual inflow — measure it with the built-in rise-rate guide or estimate… Open calculator Hydraulics Pipe Size Selector & Velocity Calculator Find the velocity, velocity head, and Reynolds number for a flow and pipe, and compare velocity across nominal… Open calculator Applications HVAC Hydronic Pump Sizing (BTU/h → GPM) Convert a heating or cooling load and design ΔT into circulator flow and head — with a proper… Open calculator