Science
Three-phase power
Estimate balanced three-phase real power.
Calculators / Science / Single-phase AC power
Single-phase AC power calculator
Estimate real, apparent, and reactive power for a single-phase AC load.
On this page
Apparent power2.3kVA
Real power1.84kW
Reactive power1.38kVAr
Calculator controls
How to calculate
Estimate real, apparent, and reactive power for a single-phase AC load.
S = V × I; P = S × power factor; Q = S × √(1 − PF²)
Worked example
RMS voltage (V): 230; RMS current (A): 10; Power factor: 0.8.
Apparent power: 2.3 kVA; Real power: 1.84 kW; Reactive power: 1.38 kVAr.
Assumptions and limits
Assumes sinusoidal steady-state values. Harmonics, inrush, phase angle sign, and equipment efficiency need separate analysis.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate real, apparent, and reactive power for a single-phase AC load. Every assumption remains visible so the result can be checked or changed.
When this tool is useful
Use the single-phase ac power for an initial estimate, comparison, or classroom calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| RMS voltage (V) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| RMS current (A) | Enter a number of at least 0 and no more than 1000000000000. |
| Power factor | Enter a number of at least 0 and no more than 1. |
Frequently asked questions
What are the limits of this single-phase ac power?
Assumes sinusoidal steady-state values. Harmonics, inrush, phase angle sign, and equipment efficiency need separate analysis.
Can I use different units?
Use the units printed beside each field. Convert measurements first when your source uses different units.