Power Calculator (AC/DC)

Calculate electrical power in both AC and DC circuits. For AC circuits, calculate apparent power (VA), real power (W), and reactive power (VAR).

V
V
Hz

Reference

DC Power Formulas
  • Power (P) = Voltage (V) × Current (I)
  • Power (P) = V² ÷ Resistance (R)
  • Power (P) = I² × Resistance (R)
AC Power Formulas
  • Apparent Power (S) = V × I
  • Real Power (P) = V × I × cos φ
  • Reactive Power (Q) = V × I × sin φ
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