ONE FORMULA, ONE ANSWER
AC Real Power Calculator
Calculate average real power from sinusoidal RMS voltage, current and phase. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Real power P
Enter values and select Calculate.
P = V_rms I_rms cosφ
Assumptions
Required: nonnegative RMS values and −180°≤φ≤180° for sinusoids at the same frequency. Signed real power is allowed. Nonsinusoidal total power factor, apparent power and reactive power are excluded.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
This site includes Google advertising and analytics, and Cloudflare analytics.