About FieldCalc

FieldCalc offers free basic calculations for people working with motors and machinery. Use it on a phone or computer without installing an app.

Calculators

Tools cover gear ratio and output RPM, pulley speed, motor torque, and kW, HP and PS conversion. Formulas and examples explain how inputs relate to results.

Languages and units

Choose Korean or English, and select SI or US units separately using the country and units setting.

Using results

Results support basic checks under ideal conditions. For equipment selection or settings, check manufacturer specifications, efficiency, friction, belt slip and load conditions. Motor torque calculations use mechanical shaft power rather than electrical input power.