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Calculator Answers

Amps to Watts Calculator

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

An amps to watts calculator is an electrical engineering utility that computes electric power in watts based on the current drawing rate in amperes and the voltage of the circuit. The tool handles DC systems using the direct product of current and voltage, and AC systems by factoring in the electrical power factor and phase configurations (single-phase vs. three-phase). Electricians and homeowners use it to size circuits and avoid overloading breakers.

Convert electric current in amperes to power in watts. Supports DC, AC single-phase, and AC three-phase circuits.

See also: Watts to Amps Calculator, Kilowatts to Amps Calculator, and Horsepower to Amps Calculator.

Quick Answer

Convert electrical current in amperes to power in watts. Enter current, voltage, and power factor to calculate watts instantly.

Current Type

Formula Used

Watts = Amps × Volts = 10 × 120

Amps to Watts

Power (Wattage)

1,200 W

At 120V (DC)

Current10 A
Voltage120 V
Real Power1,200 W
Apparent Power1,200 VA

This calculator converts electric current in amperes to electric power in watts. For AC circuits, it adjusts for the power factor representing efficiency and phase displacement.

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How it works

Electric Power Formulas

The formulas used to convert amperes (A) to watts (W) depend on the type of electrical system:

Direct Current (DC)

Watts = Amps × Volts

Alternating Current (AC) Single-Phase

Watts = Power Factor × Amps × Volts

Alternating Current (AC) Three-Phase

Watts = 1.732 × Power Factor × Amps × Volts

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Frequently asked questions

To convert amps to watts, multiply the current in amps by the voltage in volts. For direct current (DC) circuits, the formula is W = A × V. For alternating current (AC) circuits, multiply the current and voltage by the power factor: W = PF × A × V for single-phase systems.

For three-phase AC circuits, the formula is: Watts = 1.732 × Power Factor × Amps × Volts, where 1.732 represents the square root of 3, and Volts is the line-to-line voltage.

If an appliance draws 10 amps on a standard 120V single-phase household outlet (with a typical power factor of 1.0), the calculation is: Watts = 10 A × 120 V × 1.0 = 1,200 W.

Watts represent 'real power' that actually performs work (like heating or mechanical rotation). Volt-amperes represent 'apparent power', which is the simple product of current times voltage. In AC circuits, Real Power (W) = Apparent Power (VA) × Power Factor.