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Watts to Amps Calculator


This calculator is designed to convert watts in an electrical circuit to amperes. Watt is a unit of electrical power. On the other hand, an ampere is a basic unit of electrical current. Sometimes an electrician, electrical engineer, or a student working on circuits may need to convert the watt to amp, given the voltage in a circuit is known.

If you are looking for some tool to assist you in this matter, look no further, our watts to amps calculator will help you out. In this article, you will learn the concepts of watts, amperes and voltage, their calculation, and different types of amperage.

Concepts of watts, amps, and volts:

Whenever, we talk about electricity, these three important components are always mentioned. The question is what is the difference between these?

Let’s explain it using an analogy. If we assume electricity as water running through a pipe, it can assist us in understanding the concepts of amps, watts and volts. Amps would be depicted as the volume and speed of water rushing through the pipeline. The voltage would be the pressure exerted by water on the walls of the pipe. Watts would be portrayed as the power provided by water.

Now, let’s discuss their definitions.


An ampere is described as the unit that measures electricity. It is a measure of how fast the electrons are flowing through a conductor, e.g. a cable or electric wire. Ampere can be written as amps and denoted by letter I.


A watt is termed as the basic unit of power in electrical systems. It is a measure of how much energy is released per second in a system. It is represented by letter W or P. We can calculate the watts by multiplying voltage and amperes. The formula is given below:


For example an electric bulb, having voltage of 14V with a current of 2A, it will have power of 28 watts.


Volt is a basic unit of potential difference or electromotive force (the voltage). Defined as the electric potential difference between two points of a conductor when an electric current of 1 amp disperses, 1 watt of power between these two points. Represented by V.

How to convert watts to amps?

To understand it, you will first need to know the specific type of current you are working with. We can differentiate three main kinds of amperage:

  • AC-Single phase
  • AC-Three-phase, which can be further partitioned, depending on the setup configuration, into the following subtypes:
    • Line-to-Line Voltage(VLL), also termed as delta connection
    • Line-to-Neutral Voltage (VLN) also termed as star connection
  • Direct current (DC)

After choosing the specific current type, there are specific formulas to compute the required values.

The formula in case of is expressed as:


The expression for AC single- phase is given as:

$$I\;=\;\frac{P}{V × PF}$$

Here PF represents the power factor, it defines the ratio between the actual power, which does the work, and the one delivered to the circuit. It differs from 0 to 1.

The expression for AC three-phase, varies by a constant factor, as given below:

$$I\;=\;\frac{P}{\sqrt 3*\text{V}×\text{PF}}$$for VLL or delta connection.

$$I\;=\;\frac{P}{ 3*\text{V}×\text{PF}}$$for VLL or delta connection.

Line to line vs. line to neutral voltages:

A three-phase current is mostly used in the electric circuits that are linked to our homes. As the word three-phase speaks for itself that this system consists of three distinct wires. Each wire conducting the same electric signal in an altered phase. Moreover, another wire of neutral potential refers to the ground.

The voltage between any two wires is constantly higher compared to any cable and neutral wire. All these wires are interconnected at the receiving end. Their arrangement can be applied in two ways; delta and star configuration. The variation in end connection results in diverse output power.

How our watts to amps calculator works?

Before we demonstrate the working of our watt to amp calculator, let’s consider an example. Assume that you need to know the amperes of three-phase AC, line-to-neutral voltage, having an amplitude of 120 volts, with power of 4000 watts. We consider the PF to be of the value 0.8.

  1. At first, put the values in watts to amps formula for 3 Phase VLN: $$I\;=\;\frac{P}{3 × V × PF}$$
  2. Solve the equation = 4000/(3*120*0.8) = 14 amps

Just put the required values and in the specific formula to get the value, or you can get this done by an easy way, using our online watts to amps calculator. Our precise tool will calculate the above mentioned value with accuracy and lightning speed, saving you a lot of time. All you have to do is fill the required fields; select current type, enter voltage and power. Good luck!

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