8 Best Free Online Watt Calculator Websites

Here is a list of best free online watt calculator websites. Watt is a unit of Power that indicates the rate of energy transfer in electrical circuits. To find out the wattage of a circuit, users need some known values like current, voltage, resistance, etc. Now, users can either manually calculate the watt value or use simple online watt calculator websites.

These watt calculator websites come with simple watt calculator tools that simplify the process of wattage calculation. To perform the calculation, users need to enter the values of current, voltage, and resistance. On some websites, users can also specify the SI units of Power like Watt, Milliwatt, Microwatt, etc. Apart from wattage calculation, users can also perform voltage and current calculations on most of these websites. The process to perform watt calculation is quite simple on all these websites. Still, to help you out, I have also included the steps of calculation in the description of each website.

These websites also offer additional tools that may come in handy. Using additional tools, users can calculate Age, BMI, Grade, LED Bulb Power Usage, etc. Go through the list to know more about these websites.

My Favorite Online Watt Calculator Website:

rapidtables.com is my favorite website as it can show the calculated wattage value in multiple SI units. Plus, it can also be used to calculate Resistance, Current, and Voltage values.

You can also check out lists of best free Online Glass Weight Calculator, Online Concrete Slab Calculator, and Online Hydroelectric Power Calculator websites.

rapidtables.com

rapidtables.com is a free online Watt calculator website. This website offers a simple watt calculator that uses Resistance, Current, and Voltage values to find out the exact watt value. It can also find the wattage of a circuit in mW, KW, MW, etc., units. This calculator can also be used to find out the Resistance, Current, and Voltage values by entering known input values. Now, check out the below steps to calculate the watt value using this online calculator.

How to calculate watt online using rapidtables.com:

Visit this website using the given link.
After that, enter the values of Resistance, Current, and Voltage. Users can also choose to enter only two of the three input values.
Next, choose the Power SI unit from available ones like Watt, milliwatt, megawatt, etc.
Lastly, hit the Calculate button to view the final wattage of a circuit.

Additional Features:

This website comes with multiple online calculators such as Age Calculator, BMI Calculator, Grade Calculator, GPA Calculator, Wire Guage Calculator, and more

Final Thoughts:

It is a good online Watt calculator website that can also be used to find out the Current, Voltage, and Resistance value of a circuit.

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energyusecalculator.com

energyusecalculator.com is another free online Watt calculator website. This website offers a combined Watts, Volts, Amps & Ohms Calculator. In this calculator, users need to enter the value of Voltage, Current, and Resistance to find out the wattage of a circuit. Users can also choose to enter the values of any two parameters from three available ones. This website also shows the formula that it uses to perform the Watt calculation. Now, follow the below steps.

How to calculate watt value of a circuit using energyusecalculator.com:

Go to this website and access the Watts, Volts, Amps & Ohms Calculator.
After that, enter all three or any two input values.
Lastly, click on the Calculate button to view the final watt value.

Additional Features:

This website offers multiple online energy calculators such as LED Bulb usage, Cell Phone Charger electricity usage, Water Heater energy usage calculator, and more.

Final Thoughts:

It is another capable online Watt calculator website that anyone can use to quickly calculate the wattage of a circuit.

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omnicalculator.com

omnicalculator.com is a free online universal calculator website that also contains a watt calculator tool. Through this calculator, users can find out the wattage of a circuit in watt, picowatt, nanowatt, kilowatt, etc., units. To perform the calculation, users need to enter either Resistance & Voltage, Resistance & Current, and Voltage & Current values. This website also shows the watt calculation formula along with steps of calculation on its interface. Now, check out the below steps.

How to calculate watt value of a circuit using omnicalculator.com:

Visit this website and access the watt calculator.
After that, input values like current, resistance, etc.
Lastly, specify the watt unit to view the final wattage value.

Additional Features:

On this website, users can find multiple online calculators associated with different fields like Chemistry, Mathematics, Physics, Health, and more.

Final Thoughts:

It is another capable online universal calculator website that offers a simple circuit wattage calculator.

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circuitdigest.com

circuitdigest.com is another free online universal calculator website. Using this website, users can calculate the watt value using voltage and current values. It also shows the formula that it uses to perform the calculation. In the case of Current, users can enter its value in either Ampere or milliampere unit. Now, follow the below steps.

How to calculate watt value online using circuitgigest.com:

Visit this website using the given link.
After that enter the values of voltage and current.
Next, specify the SI unit of current.
Lastly, hit the Calculate button to start the calculation process.

Additional Features:

On this website, users can find many electrical and electronics calculators such as Coil Inductance Calculator, ADC Calculator, Stepper Motor Calculator, Capacitor in parallel calculator, and more.

Final Thoughts:

It is another good online universal calculator website that offers all the essential tools to calculate watt value.

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electricalsafetyfirst.org

electricalsafetyfirst.org is yet another free online watt calculator website. Through this website, users can calculate watts using ampere, volts, and watts. It also lets users AC and DC ampere values along with line to line voltage and line to neutral voltage. Now, follow the below steps.

How to calculate watt value online using electricalsafetyfirst.org:

Visit this website and choose AC or DV current option and enter the current value.
Next, choose a voltage type and enter its value.
Now, hit the Calculate button to view the calculated wattage value.

Additional Features:

This website offers many professional electrical resources such as wiring regulations, product safety, safer installation, and more.

Final Thoughts:

It is another good online watt calculator website that anyone can use to quickly calculate the watt value using corresponding ampere and voltage values.

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supercircuits.com

supercircuits.com is yet another free online watt calculator website. Through this website, users can easily calculate Power (Watt), Voltage (Volts), and Current (Amps) values. To do that, this website uses the Watts = Amps * Volts formula. Plus, it also shows multiple examples highlighting the Watts calculation. Now, check out the below steps.

How to calculate wattage online using supercircuits.com:

Start this website and open up the Watts Converter.
Next, enter the Volts and Amps values in the input field.
Lastly, click on the Calculate button to view the final wattage.

Additional Features:

From this website, users can also purchase cloud surveillance, access control, and video security devices and services.

Final Thoughts:

It is another good online watt calculator website that offers a simple watt calculator.

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webstaurantstore.com

webstaurantstore.com is another free online watt calculator website. This website not only comes with a watt calculator tool but it also shows the steps of calculation. Apart from watts, it can also be used to calculate the amps and volts of a circuit.

How to calculate watt online using webstaurantstore.com:

Visit this website and access the Electrical calculator.
After that, enter the values of Amps and Volts in the respective fields.
Next, click on the Calculate button to start the conversion process.

Additional Features:

On this website, users can also purchase various restaurant equipment, small wares, commercial refrigeration, furniture, and more.

Final Thoughts:

It is another good website to calculate the wattage of a circuit using known voltage and current values.

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inchcalculator.com

inchcalculator.com is another free online watt calculator website. This website comes with two watts calculators namely simple and advanced. The Simple calculator can find out the watt value using known current and voltage values. On the other hand, an Advanced calculator can also incorporate DC, AC Single Phase, and AC Three Phase current to perform the watt calculation. Now, follow the below steps.

How to calculate watt online using inchcalculator.com:

Start this website and choose Simple or Advanced Calculator.
In the case of the Simple calculator, you just need to enter the Voltage and Current values. If you choose the Advanced calculator, you need to enter the Phase (DC, AC Single, or AC Triple) along with current and voltage values to perform the calculation.
Lastly, hit the Calculate button to view the calculated Watt value.