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    Construction & Electrical

    Amps to watts converter

    Current and power cannot be converted without knowing the voltage and supply system. This calculator separates active electrical input power, apparent power and useful output, so motor efficiency is not confused with power factor. It assumes steady DC or balanced sinusoidal AC, using RMS line values for AC.

    MAKE IT SIMPLE

    AC values are RMS; three-phase uses line-to-line voltage and line current, with balanced sinusoidal loads. DC ignores power factor. Watts are active electrical power, not energy (kWh).

    At 100% the entered watts are electrical input power. Below 100%, power → current treats the watts as useful/mechanical output and divides by efficiency; current → power shows both electrical input and useful output. Efficiency is different from power factor.

    Calculation basis

    DC P=VI; single-phase AC P=VI×PF; balanced three-phase AC P=√3×VLL×IL×PF. AC values are RMS.

    Result

    Worked examples

    Single-phase; 220 V; 10 A; PF 1; efficiency 100%

    2,200 W = 2.2 kW

    Voltage × current × power factor gives active input power.

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