Watt Calculator

Calculate power, in wattage, that a certain voltage and current can produce with our free calculator.

Required Information

Voltage (V):

Current (I):

Results:

What it is

What are Watts?

Create Date: July 17, 2024

Last Modified Date: January 15, 2025

A watt is a unit of power. It measures the energy expended from electrical devices and components powered by electricity. Watts are integral to the way we understand power and electricity and plays a role in dozens of different applications of these topics.

How to Calculate Wattage

Wattage can be calculated with the following variables:

Voltage

Current

Then, when you have these values you can use them in the following formula to find the wattage:

An image of the formula used to calculate how much power or wattage there is in a certain situation.

Where:

P = Power (or wattage)

V = Voltage

C = Current

Understanding Your Results

After you use this tool you will be shown two different results. You will see both the power, or wattage, and then the resistance. Each result can be changed to another unit of measurement if the default does not fit your needs.

How to Use the Wattage Tool

If you are trying to calculate for wattage or resistance than this is the tool that you are looking for. This tool is a handy calculator that will do all of the math for you so you do not have to think or crunch any numbers. The steps involved with using this tool includes:

Enter the voltage. Change the unit of measurement if needed by clicking the dropdown section.

Enter the current. Change the unit of measurement if needed by clicking the dropdown section.

Hit the calculate button and get your results instantly!

The History of Wattage

James Watt, an inventor, mechanical engineer, and chemist, significantly contributed to the advancement of power measurement in the 18th century. Although he did not coin the term or discover the formula, the unit of measurement was named "Watt" in his honor when it was added to the International System of Units (SI) in 1960.

Watts - Frequently Asked Questions

A watt is equal to 1 joule per second, representing a measure of energy per time.

1000 watts is equal to one kilowatt. The cost of electricity depends on your region's rates.

Most TVs use between 50 and 200 watts depending on the model and size.

2000 watts is moderate power, suitable for small household appliances like coffee makers or toaster ovens.

Yes, higher wattage indicates more energy output or consumption, making it more powerful.

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