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Watts to Amps Calculator

Watts to Amps Calculator

Choose the current type as AC or DC, input the power and voltage to convert watts to amps.

Amps to Watts
Watts to Amps

Current Type

Power (watts)


Voltage Type

Voltage (volts)


Power Factor (≤1)


Table of Content

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Are you curious about the power consumption of your electrical devices? Do you want to optimize energy utilization? The solution is the watts to amps calculator. With it, you can make informed decisions about electrical systems, ensuring safety, and optimizing the usage of energy.

This tool precisely converts watts to amps for DC, AC, single-phase, and three-phase circuits.

What Are Amps, Volts And Watts?

Amps(Amperes): Amp is used to determine the flow of electrical current.
Volts(Volts): Volts measure the amount of electrical force or potential applied for the flow of electricity through a conductor or wire.
Watts: Watts is the power measurement used to measure the rate at which energy is used or produced. It means the amount of energy transformed or converted per unit of time. For quick and precise calculations of watt, use our specially designed watt calculator.

AC And DC Power Systems:

You may often have seen the labels of AC and DC on different appliances or devices. These are the types of currents flowing in a circuit. The AC changes its direction while flowing in a circuit at 50 times per second (50 Hz or hertz) in the UK.

The DC does not change its direction in the circuit. A battery-powered torch is the right example of DC.

How To Convert Watts To Amps For DC Power?

The formula to convert watts to amps is as follows:

\(\ Amperes\ (A) =\dfrac{Watts (W)}{Volts (V)}\)


Suppose there is an electrical equipment that has a power rating of 200 watts and operates at a voltage of 50 volts. Now how to convert watts to amps?


Power = P =200W
Volts = V = 50 V
Put the given values in the formula to convert watt to amp:

\(\ I =\dfrac{P}{V} =\dfrac{200}{50} =\ 4\ A\)

How To Convert Watts To Amps For AC Power?

AC Single Phase Watts To Amps Calculation:

To convert watts to amps for AC power, use the following formula:

\(\ I_{(A)} =\dfrac{P_{(W)}}{PF\times\ V_{(V)}}\)

A purely resistive device has a power factor of 1.


Suppose you have an electrical device with a power rating of 1000 watts (P) which operates at a voltage of 100 (V) and has a power factor (PF) of 0.7. Now how to determine how many amperes (A) the device draws.


P = 1000 watts
V = 100 V
PF = 0.7
By putting values in the formula:

\(\ I_{(A)} =\dfrac{P_{(W)}}{PF\times\ V_{(V)}}\)

\(\ I =\dfrac{1000W}{0.7\times 100}=\dfrac{1000}{70} =\ 14.28 A\)

AC Three Phase Watts To Amps Calculation:

Line To Line Voltage:

\(\ I_{(A)} =\dfrac{P_{(W)}}{\sqrt{3}\times\ PF\times\ V_{L-L(V)}}\)


  • FP represents the efficiency of a device that is using energy to perform a task. In other words, it shows how much real energy in watts a device consumes
  • Watts = This is the actual power of electrical equipment
  • \( V_{L-N} \text{ represents the line-to-neutral voltage, which is a characteristic datum of electrical systems} \)
  • \( V_{L-N} \text{ is the line-to-neutral voltage, which is a used in three-phase AC} \)

Line To Neutral Voltage:

\(\ I_{(A)} =\dfrac{P_{(W)}}{\ 3\times\ PF\times\ V_{L-N(V)}}\)

Typical Power Factor: It represents the proportion of usable energy to supplied energy and is dependent on the type of electrical load.

Device Typical power factor
Resistive load 1
Fluorescent lamp 0.95
Incandescent lamp 1
Induction motor full load 0.85
Induction motor no load 0.35
Resistive oven 1
Synchronous motor 0.9

Rather than performing the manual calculations, transform watts to amps effortlessly and precisely with the help of the watts to amps calculator. Simplify your power conversions and make informed decisions for a safer electrical setup.

Why Are Electrical Ratings Important?

If you apply the wrong voltage to your equipment or devices, then they will fail to operate. This is one of the most obvious reasons for electric devices or appliance failure.

To operate your appliance accurately and to enhance its life span, it’s necessary to use the right voltage as per the need of the drive or appliance. Otherwise, the device or appliance will start malfunctioning or may get damaged in a short period.

Why Convert Watts To Amps?

The conversion from watts to amps is essential in electrical calculations for the management of current flow in various circuits. Here’s why it’s important:

  • Understanding Current Requirements: The current in amps helps to understand whether the electrical components such as wires and breakers, can effectively manage the load.
  • Sizing Electrical Components: It helps to use the right size wires and circuit breakers so that they can handle a specific amount of current with ease. For precise determination of the wire size needed for your electrical circuit, use our wire size calculator.
  • Compliance with Codes and Standards: The conversion from watts to amps ensures compliance with Electrical Codes and Standards.
  • Balancing Electrical Loads: Knowing the current draw-in amps helps to prevent overloading and failure of electrical circuits.

Watts To Amps Conversion Table:

Watts Amps @ 120V Amps @ 220V Amps @ 240V
100W 0.83A 0.45V 0.42A
200W 1.67A 0.91V 0.83A
300W 2.5A 1.36V 1.25A
400W 3.33A 1.82V 1.67A
500W 4.17A 2.27V 2.08A
600W 5A 2.73V 2.5A
700W 5.83A 3.18V 2.92A
800W 6.67A 3.64V 3.33A
900W 7.5A 4.09V 3.75A
1000W 8.33A 4.55V 4.17A


How Many Watts In 1 Amp?

The watts in one amp is determined by the voltage of the system. According to the DC conversion formula: Watts = Amps x Volts, at 120 volts, which means 1 amp would equal 120 watts.

How Many Watts Can A 15 Amp Breaker Handle?

Usually, a 15-amp breaker is capable of handling approximately 1K light each without tripping or around 1800 to 2000 watts.