Watts To Volts Converter (W to V): Calculator + Conversion Chart

If we know the amperage (A), we can easily convert watts to volts. For the W to V conversion, we can use the formula for electric power:

P (W) = I (A) * V (V)

To calculate volts from watts, we need to rearrange this formula by expressing voltage like this:

Volt = Watts / Amps

To convert watts to volts, we need to know how many amps does the electrical circuit has.

Example 1: 1 volt is equal to how many watts? If you have a 1 amp circuit, 1 volt is equal to 1 watt. If you have a 100 amp circuit, 1 volt is equal to 100 watts.

Example 2: How many watts in a volt? Amps are the key here as well; in a 1 amp circuit, you have 1 watt per volt. If you have a 10 amp circuit, you will have 10 watts in a volt.

You can freely use this handy watts to volts calculator by inserting W and A. Further on, you’ll find a conversion chart with calculated volts from watts at certain amps:

Watts To Volts Calculator


Watts To Volts Conversion Chart

It’s useful to know how many volts are in a watt.

In short, 1 watt is equal to 1 amp (at 1V). Based on this, we can calculate this conversion table:

Watts (W) Amps (A) Volts (V)
How many volts in 1 watt? 1 amp 1 volts
How many volts in 2 watts? 1 amp 2 volts
How many volts in 10 watts? 1 amp 10 volts
How many volts in 20 watts? 1 amp 20 volts
How many volts in 50 watts? 1 amp 50 volts
How many volts in 100 watts? 1 amp 100 volts
How many volts in 200 watts? 1 amp 200 volts
How many volts in 500 watts? 1 amp 500 volts
How many volts in 1000 watts? 1 amp 1000 volts
How many volts in 2000 watts? 1 amp 2000 volts
How many volts in 3000 watts? 1 amp 3000 volts
How many volts in 4000 watts? 1 amp 4000 volts
How many volts in 5000 watts? 1 amp 5000 volts

If you have any specific watts to volts conversion in mind, you can use the comments below and we’ll try to help you out. Please do include the amperage (A).

17 thoughts on “Watts To Volts Converter (W to V): Calculator + Conversion Chart”

    • Hello Howard, the combined wattage is 665W and you have a 150V charge controller. That controller needs to handle 665W/150V = 4.5 amps. If it can, then it’s good; if not, you can’t really do this.

        • Hi Patrick, it will work. The combined 500W solar panels will probably produce 2.5 kWh per day (given 5 peak sun hours). 150Ah 12V battery has a 1.8 kWh capacity. It sounds like a nice little solar system.

    • you can not mix wattage to a mppt. 100 watt panels with 100 watt panels. 250 with 250. 300 with 300. if you plan on doing it like that you will destroy your mppt. The only way you may mix panels is if you get a second mppt and hook up your odd end to that. let me explain. say i have 3 solar panels 2 are 100 watts and the third is 250 watts you may hook up both of the 100 watt panels to one charge controller and the 250 watt needs to go to a second charge controller

  1. I want to combine 2 solar panel. one is 250 watts the other one is180 watts my charge controller is 24 volts, so how many ampere of battery will I need?

    • Hello there, you can tally up the wattages and calculate amps from there (since you know the voltage). You’re dealing with 250W + 180W = 430 watts and you have a 24-volt circuit. Here’s how you can calculate amps: 430W / 24V = 18 amps. You will need at least 18 amp battery, 20 amp would be the safe option.

  2. I have a 220 volts electric system in my country.can a hair dryer of 12Vac,60Hz,950 W
    Work on this electricity?

    • Hello, you usually have a 220V circuit with a 12A, 16A, or 20A breaker. These circuits can easily handle more than 2,000W; a 950W hair dryer will work on this electricity without problems.

    • Hi Barbara, the best article for this would be this generator sizing article. In short, you need to know the start-up wattage and running wattage of your portable welding machine. Portable welding machines usually require quite a lot of power; 200 amps 110V machine will run on 22,000W. The peak wattage (start-up wattage) will be about 25,000W-30,000W. So, you would need a generator that can provide 30,000 watts of power; 30kW generator. Hope this helps.


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