Engineering calculators for the plant floor.

Convert boiler horsepower to steam output (lb/h and kg/h), kW and Btu/h, or work back from steam demand to the boiler size you need.

Calculate the continuous blowdown rate a steam boiler needs from feedwater and boiler-water TDS, the cycles of concentration, and the heat and water lost.

Estimate boiler combustion efficiency, stack loss and excess air from flue-gas O2 and stack temperature with the Siegert formula, for gas, oil or propane.

Estimate the energy and cost a variable frequency drive saves on a centrifugal fan or pump, using the affinity laws and your operating hours at each speed.

Calculate the load-to-motor inertia ratio for a servo axis, including a gearbox or belt reduction and a disc or cylinder load, and see whether tuning will be easy.

Calculate spindle RPM and feed rate for milling and drilling from cutting speed, tool diameter, chip load and flutes, in inch or metric units.