Engineering Calculators

Free tools with formulas, worked examples, and unit conversions built in.

10 calculators across 4 engineering disciplines.

Boiler Feed Pump Calculation

Size a boiler feed pump: required flow, total dynamic head, hydraulic and brake power.

Size a centrifugal pump: hydraulic power, brake power and motor kW from flow, head and efficiency.

Compute NPSH available to protect a pump from cavitation using pressure, temperature and suction geometry.

Estimate a room's cooling load (BTU/hr and tons) from area, occupants, lighting, equipment and climate.

Size a steam boiler in BHP, BTU/hr and kW from steam demand, pressure and feedwater temperature.

Measure the real-world efficiency of a boiler feed pump from field data: flow, differential pressure and shaft power.

Estimate steam mass flow through a pipe from pressure, pipe size and velocity — quick sanity check for steam distribution.

Compute Darcy–Weisbach friction head loss for water flow through a pipe — includes fittings equivalent length.

Estimate cooling tower makeup water: evaporation, blowdown, drift and total consumption from range, flow and cycles of concentration.

Quantify condensate return rate, flash steam losses, and dollar savings from returning condensate to the boiler.