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.

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

Hydraulics Friction Loss Calculator (Hazen-Williams) Calculate water friction head loss with the Hazen-Williams equation from flow, pipe size, length, and the C roughness… Open calculator Hydraulics Friction Loss Calculator (Darcy-Weisbach) Calculate pipe friction head loss and pressure drop with the Darcy-Weisbach equation — showing velocity, Reynolds number, friction… Open calculator Hydraulics NPSH Available (NPSHa) Calculator Calculate net positive suction head available from altitude or vessel pressure, liquid temperature, static head, and friction —… Open calculator Power & Energy Pump Power Calculator (Hydraulic, Brake & Motor) Calculate hydraulic (water) power, brake power at the shaft, and electrical motor input — in HP and kW… Open calculator Hydraulics Total Dynamic Head (TDH) Calculator Calculate total dynamic head from static head, friction loss, vessel pressure, and velocity head — in feet and… Open calculator