8 Best Free Online Heat Index Calculator Websites

Here is a list of best free online heat index calculator websites. Heat Index or apparent temperature is a temperature that our body feels in various weather conditions. It is also described as the combination of relative heat and air temperature. This index helps users find out a range of comfortable and uncomfortable heat index values for their bodies. To calculate the heat index, users can try these online heat index calculator websites. These calculators use Air Temperature and Relative Heat values as input to calculate the heat index. Although, some of these websites can also use Dew Point and Air Temperature values to find out the heat index. On most websites, users can also choose an SI unit for air temperature from available ones namely Celcius, Fahrenheit, and Kelvin. After specifying all the parameters and units, users can start the calculation process.

The process to calculate heat index is simple on all websites as users just need to enter a couple of input parameters. Still, users can find steps to calculate the heat index in the description of each website. A good set of additional calculators are also provided by some websites like Scientific Calculator, Fraction Calculator, Percentage Calculator, etc. Go through the list to know more about these websites.

My Favorite Online Heat Index Calculator Website:

iweathernet.com is my favorite website as it can use both relative temperature and dew point values to calculate the heat index. Plus, it also generates a heat index chart.

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iweathernet.com

iweathernet.com is a free online heat index calculator website. This website offers a lot of reading material explaining the heat index along with a heat index calculator. This calculator can use either Air Temperature and Relative Humidity or Air Temperature and Dew Point parameters to calculate the heat index. Besides this, it also shows general heat index charts calculated using dew points and relative humidity. Now, check out the below steps.

How to calculate heat index online using iweathernet.com:

Visit this website using the given link.
After that, enter air temperature and relative humidity or air temperature and dew point values.
Lastly, click on the Calc HI button to view the output heat index values.

Additional Features:

On this website, users also get weather reports, weather data, weather forecasts, etc., information.

Final Thoughts:

It is a simple-to-use online heat index calculator website that anyone can use to calculate the heat index.

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calculator.net

calculator.net is a free online heat index calculator website. Using this website, users can calculate the temperature felt on the body because of surrounding air temperature and relative humidity. It also lets users specify the air temperature unit (Celcius, Fahrenheit, or Kelvin) that also affects the output heat index value. Depending on the output heat index value, it shows a status like safe temperature, hot, extremely hot, etc. Now, follow the below steps to calculate the heat index using this website.

How to calculate heat index online using calculator.net:

Visit this website and open up the heat index calculator.
After that, enter Air Temperature and Relative Humidity value.
Next, specify the air temperature unit from available ones Celcius, Fahrenheit, or Kelvin to view the output

Additional Features:

Related Calculators: A good set of related calculators such as Dew Point Temperature Calculator, Wind Chill Calculator, Dew Point Calculator are also present in it.
Other Calculators: It also offers many additional calculators such as Scientific Calculator, Fraction Calculator, Percentage Calculator, Random Number Generator, and more.

Final Thoughts:

It is another capable online heat index calculator website through which users can quickly calculate the temperature felt by a body.

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wpc.ncep.noaa.gov

wpc.ncep.noaa.gov is a free whether prediction website that can also be used as an online heat index calculator. To calculate the heat index, it offers a dedicated Heat Index Calculator tool. This tool can calculate the heat index either by using dew point temperature or relative humidity values. Plus, it also lets users input the air temperature value in both Celcius and Fahrenheit units. Now, follow the below steps.

How to calculate heat index online using wpc.ncep.noaa.gov:

Visit this website using the given link.
After that, enter the Air Temperature value.
Now, enter either Dew Point Temperature value or Relative Humidity percentage.
Lastly, click on the Calculate button to start the conversion process.

Additional Features:

This website can also generate heat index charts and WPC heat index forecasts.
A good set of weather tools are also provided by it such as Surface Analysis, Winter Weather, Storm Summaries, Heat Index, and more.

Final Thoughts:

It is another good online heat index calculator website through which users can easily calculate the heat index.

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omnicalculator

omnicalculator is another free online heat index calculator website. This website also offers many other calculators according to its name. To calculate the heat index, it uses Temperature, Relative Humidity, and Dew Point Values. Users can change the SI units of both Temperature and Dew Point parameters between Celcius, Fahrenheit, and Kelvin. Now, follow the below steps to calculate the heat index using this website.

How to calculate heat index online using omnicalculator:

Start this website and enter the Temperature, Relative Humidity, and Dew Point values.
After that, specify the SI unit of temperature and relative humidity.
Lastly, start the calculation process and view the output.

Additional Features:

Related Calculators: Some related calculators such as Air Density, Air Pressure, Cloud base, etc., are also present in it.
Additional Calculators: This website also offers multiple calculators associated with Finance, Maths, Food, Sports, and more.

Final Thoughts:

It is another good online heat index calculator website that offers all the essential tools to accurately calculate the heat index of a body.

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planetcalc.com

planetcalc.com is a free online heat index calculator website. It is another good website that can calculate the heat index using the Air temperature and Relative Humidity values. It can also take temperature values in both Celcius and Fahrenheit units. It also allows users to specify the number of decimal digits they want after the decimal of the output heat index value for precision. Now, follow the below steps.

How to calculate heat index online using planetcalc.com:

Launch this website and open up the Heat Index section.
Next, enter the Air Temperature and Relative Humidity values.
After that, specify the decimal points and hit the Calculate button to start the calculation process.

Additional Features:

A good set of similar calculators are also provided by it such as Humidax Calculator, Apparent Temperature Calculator, Quantity of Heat Calculator, and more.

Final Thoughts:

It is another capable online heat index calculator website that anyone can use to accurately calculate the heat index using temperature and relative humidity values.

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stelizabeth.com

stelizabeth.com is yet another free online heat index calculator website. This website offers a simple heat index calculator tool that uses Temperature and Relative Humidity values. The input temperature value can only be entered in Fahrenheit, unlike other similar websites that support Celcius and Kelvin units. Now, check out the below steps,

How to calculate heat index online using stelizabeth.com:

Start this website using the given link.
After that, enter the Air Temperature and Relative Index values.
In the end, click on the Calculate button to get the final heat index value.

Final Thoughts:

It is one of the simplest online heat index calculator websites that anyone can use without much hassle.

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goodcalculators.com

goodcalculators.com is another free online heat index calculator website. This website offers many online calculators one of which is th heat index calculator. This calculator allows users to calculate heat index using Relative Humidity Percentage and Air Temperature values. Users can input air temperature values adhering to Celcius, Fahrenheit, and Kelvin units. It also generates and shows a heat index chart on its interface.

How to calculate heat index online using goodcalculators.com:

Go to this website and access the heat index calculator section.
After that, specify the temperature unit.
Now, enter the Temperature and Relative Humidity value.
In the end, hit the Calculate button to view the output heat index value.

Additional Features:

This website also offers many additional calculators such as Water Intake Calculator, Overtime Calculator, Ratio Calculator, Stock Calculator, and more.

Final Thoughts:

It is another simple-to-use online heat index calculator website that offers all the essential tools to find out the heat index value.

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calculators.io

calculators.io is the last free online heat index calculator website. This website offers a simple heat index calculator tool. In the calculator tool, users can input Air Temperature and Relative Humidity values. After Plus, air temperature adhering to multiple units (Celcius, Fahrenheit, and Kelvin) are also supported by it. Besides this, it also provides theoretical content explaining the heat index. Now, follow the below steps to calculate the heat index using this website.