Free Online Electrical Power Calculator

Calculate electrical power from voltage and current.

V
A
Result Unit
Power: -
Formula: P = V × I

About This Tool

This free online electrical power calculator solves power from voltage and current. Enter volts and amps to calculate watts, kilowatts, or milliwatts.

It is useful for checking device loads, estimating circuit power, comparing adapters, and understanding the formula P = V * I.

Benefits and Use Cases

  • Calculate electrical power from voltage and current
  • Estimate watts for devices and circuits
  • Support adapter, wiring, and power supply checks
  • Convert between watts, kilowatts, and milliwatts

How to Use

  1. Enter the voltage.
  2. Enter the current.
  3. Select the correct units.
  4. Click Calculate.

Frequently Asked Questions

What formula does this electrical power calculator use?

It uses power = voltage * current.

What inputs do I need?

You need voltage and current.