±Free
AC electrical power
Compute single-phase real, apparent and reactive power from RMS voltage/current and power factor.
Enter nonnegative RMS voltage and current plus a power factor from 0 to 1. The calculator uses S = VI, P = S × PF and Q = S√(1−PF²) to return apparent, real and reactive power.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
RMS voltage (V): 100 RMS current (A): 2 Power factor (0–1): 0.8
Example result
{
"apparentVA": 200,
"realWatts": 160,
"reactiveVAR": 120
}Limitations and details
Uses a single-phase power-triangle model; reactive power is an unsigned magnitude, with no lead/lag or three-phase calculation.
Inputs and options
- RMS voltage (V)
- Number
- RMS current (A)
- Number
- Power factor (0–1)
- Number · Minimum: 0 · Maximum: 1
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.