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Free Electric Power
Calculator

Advanced free electric power calculator for DC, single-phase AC, three-phase AC, power-factor correction, and energy cost, with power triangles, phase quantities, capacitor sizing, unit conversion and local-only processing.

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About Free Electric Power Calculator

Calculate DC power, single-phase and balanced three-phase AC power, size ideal power-factor correction capacitors, or turn electrical load profiles into energy and cost estimates.

Workspace options

  • Voltage V
  • Current I
  • Resistance R
  • Power P

Available actions

  • ☼ / ◐
  • DC / resistive
  • Single-phase AC
  • Three-phase AC
  • Power-factor correction
  • Energy & cost