Electrical
Electrical and mechanical engineering calculators using standard physical constants, cited on every page.
Ω
Ohm's Law Calculator
Solve Ohm's law for voltage, current, resistance or power. Enter any two known values and get all four quantities with the formulas V=IR and P=VI.
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Voltage Drop Calculator
Calculate voltage drop for copper or aluminum conductors in DC, single-phase or three-phase circuits from length, current and cross-section in mm².
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Watt Converter
Convert power between watts, kilowatts, megawatts, mechanical horsepower, metric horsepower (PS) and BTU/h. 1 hp = 745.7 W; 1 PS = 735.5 W.