What is the Power Calculator?
The power calculator is a free online tool that helps you work out power quickly and accurately. It uses the standard formula 1ph: P = V x I x pf; 3ph: P = sqrt(3) x V x I x pf and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter voltage and current.
- Choose phase and power factor.
- See the power.
Formula used
1ph: P = V x I x pf; 3ph: P = sqrt(3) x V x I x pfExplanation of each input
- Voltage (V) โ the voltage used in the calculation.
- Current (A) โ the current used in the calculation.
- Supply โ the supply used in the calculation.
- Power factor โ the power factor used in the calculation.
Understanding your result
- Power โ the calculated power in W.
- Power โ the calculated power in kW.
Step-by-step calculation
For the example values 230V, 10A, 1ph:
- Apply the formula:
1ph: P = V x I x pf; 3ph: P = sqrt(3) x V x I x pf - Substitute the values: 230x10x1
- Result: 2300 W
Worked example
| Inputs | 230V, 10A, 1ph |
|---|---|
| Working | 230x10x1 |
| Result | 2300 W |
Benefits and practical uses
This calculator saves you time and reduces errors when you need power. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- AC supply; balanced load for 3-phase.
Frequently asked questions
What is power factor?
The ratio of real to apparent power; 1 means a purely resistive load.
Disclaimer: Results are provided for general information. Please verify important figures independently.