Ampere to Watt Calculator

Convert electrical current (amps) to power (watts) instantly with our free online calculator.

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About This Tool

This ampere to watt calculator allows you to quickly convert electrical current in amperes (amps) to power in watts. Simply enter the current in amps, voltage in volts, and optionally the power factor (default is 1 for DC or resistive AC loads) to get the accurate wattage. The tool uses the formula: Watts = Amps × Volts × Power Factor. It's perfect for electricians, engineers, students, and DIY enthusiasts working with electrical systems.

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How to Use

Enter the current in amperes (amps) in the 'Current' field.
Enter the voltage in volts in the 'Voltage' field.
Optionally, enter the power factor (between 0 and
for AC circuits; leave as 1 for DC or resistive loads.
Click the 'Calculate Watts' button to see the result.
View the calculated wattage displayed below with a detailed breakdown.

Frequently Asked Questions

Find Quick Answers

What is the formula for converting amps to watts?

The formula is: Watts = Amps × Volts × Power Factor. For DC circuits or resistive AC loads, the power factor is 1, so it simplifies to Watts = Amps × Volts.

What is power factor and when should I use it?

Power factor is a ratio (between 0 and 1) that represents the efficiency of AC electrical power usage. Use it for AC circuits with inductive or capacitive loads (e.g., motors, transformers). For DC circuits or purely resistive AC loads, set it to 1.

Can I use this calculator for three-phase systems?

This calculator is designed for single-phase systems. For three-phase calculations, you would need to include the square root of 3 (≈1.732) in the formula: Watts = Amps × Volts × Power Factor × √3.

What units does this calculator support?

It supports current in amperes (amps), voltage in volts, and power factor as a unitless decimal. The result is in watts (W).

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