7 Best Free Online Relative Humidity Calculator Websites

Here is a list of best free online relative humidity calculator websites. Relative Humidity is the amount of water vapor or moisture present in the air. It is expressed as a percentage of the maximum amount of water that air can hold at its current temperature. In general, warmer air holds more water when compared to colder air. To find out the relative humidity in various temperatures, users can try these online relative humidity calculator websites.

These websites help users calculate relative humidity using the air Temperature and Dew Point values. Some websites also show the formula that they use to calculate the relative humidity. These websites also explain relative humidity and show its calculation process. Apart from Relative humidity, some of these websites can also calculate Due Point and Air Temperature values. To help new users, I have also included the necessary calculation steps in the description of each website.

These websites also offer additional tools such as Absolute Humidity, Air Density, Air Pressure at altitude, Time Card, Finance, Geometry, and more. Go through the list to learn more about these websites.

My Favorite Online Relative Humidity Calculator Website:

omnicalculator.com is my favorite website as it also explains the relative humidity in detail. Plus, it shows the relative humidity calculation formula.

You can also check out lists of best free online Online Dew Point Calculator, Online Greenhouse Heater Calculator, and Online Activation Energy Calculator websites.

Comparison Table:

Features/Website Names	Explains Relative Humidity	Shows Calculation Formula	Shows calculation steps or process
omnicalculator.com	✓	✓	✓
1728.org	x	✓	✓
ringbell.co.uk	x	x	x
bmcnoldy.earth	x	x	✓
blackhawksupply.com	x	✓	✓
holsoft.nl	x	x	x
weather.gov	x	x	x

omnicalculator.com

omnicalculator.com is a free online relative humidity calculator website. Using this website, users can calculate the relative humidity in the air. To do that, it uses Temperature and Dew Point values. Plus, multiple temperature units are supported by it like Celsius, Kelvin, and Fahrenheit. It also explains relative humidity and shows the formula that it uses to calculate relative humidity. It also provides the calculation steps. Now, follow the below steps.

How to calculate relative humidity online using omnicalculator.com:

Visit this website and access the Relative Humidity Calculator.
After that, enter the Temperature and Dew Point values.
Next, specify the units of both input parameters.
Finally, view the calculated relative humidity in percentage.

Additional Features:

This website has some related calculators like Absolute humidity, air density, air pressure at altitude, dew point, and more.

Final Thoughts:

It is one of the best free online relative humidity calculator websites that also explains relative humidity and provides calculation steps.

Pros	Cons
Explains relative humidity
Shows calculation formula
Provides calculation steps

Home Page

1728.org

1728.org is another free online relative humidity calculator website. It is a good website to determine the relative humidity in percentage. To do that, it uses dry bulb and wet bulb temperature values as input. Users can enter input values in both Celsius and Fahrenheit units. It shows the relative humidity calculation formula that it uses. Plus, a complete process involved in the relative humidity calculation is also provided. Now, follow the below steps.

How to calculate relative humidity online using 1728.org:

Go to this website and open up the relative humidity calculator.
After that, choose Fahrenheit or Celsius unit.
Next, submit dry bulb and wet bulb values.
Finally, click on the Calculate button to view the relative humidity value.

Additional Features:

This website also has multiple calculators covering fields like time card, finance, geometry, trigonometry, physics, astronomy, and more.

Final Thoughts:

It is another good online relative humidity calculator website that anyone can use without much hassle.

Pros	Cons
Shows example of complete calculation
Shows calculation formula

Home Page

ringbell.co.uk

ringbell.co.uk is another free online relative humidity calculator website. Using this website, users can calculate relative humidity using either dry bulb & wet bulb values or dry bulb & dew point values. Besides this, it also needs atmospheric value in either millibars or inches of mercury units. Both Celsius and Fahrenheit units are also supported. Now, follow the below steps.

How to calculate relative humidity online using ringbell.co.uk:

Go to this website and access the relative humidity calculator.
After that, enter input values and choose a temperature unit.
Next, enter the atmospheric pressure value and specify its unit.
Finally, click on the Compute button to view the relative humidity value.

Final Thoughts:

It is another good online relative humidity calculator that also considers atmospheric pressure in the calculation.

Pros	Cons
Can use dry bulb & wet bulb values or dry bulb & dew point values to perform the calculation

Home Page

bmcnoldy.earth

bmcnoldy.earth is another free online relative humidity calculator website. Using this website, users can calculate the relative humidity in percentage. To do that calculation, it needs Temperature and Dewpoint values. Both Fahrenheit and Celsius temperature units are supported. It also shows the relative humidity formula. Apart from relative humidity, it can also be used to calculate temperature and dewpoint values. Now, follow the below steps.

How to calculate relative humidity online using bmcnoldy.earth:

Visit this website using the given link.
After that, choose Fahrenheit or Celsius unit.
Next, enter temperature and dewpoint values.
Finally, click on the Calculate button to view the Relative Humidity value in percentage.

Additional Features:

This website also offers tools to monitor local weather conditions and key tides.

Final Thoughts:

It is another good online relative humidity calculator website that can also be used to calculate temperature and dew point values.

Pros	Cons
Can also calculate temperature and Dew point values
Shows calculation formula

Home Page

blackhawksupply.com

blackhawksupply.com is another free online relative humidity calculator website. Through this website, users can calculate relative humidity, dew point, and temperature values. To calculate relative humidity, it needs temperature and dewpoint values either in Fahrenheit or Celsius units. It also explains all types of humidity (relative absolute, and specific) and shows formulas that it uses to calculate different types of humidity. Now, follow the below steps.

How to calculate relative humidity online using blackhawksupply.com:

Go to this website and access the relative humidity calculator.
After that, choose a temperature scale unit (Fahrenheit or Celsius).
Now, enter temperature and dewpoint values.
Finally, click on the Calculate button to view the relative humidity value.

Additional Features:

This website has a large number of HVAC supplies that users can browse and purchase like Dampers, Freeze Stats, Pneumatic Parts, Heating Supplies, etc.

Final Thoughts:

It is another good online relative humidity calculator website that can calculate relative humidity, dewpoint, and temperature parameters.

Pros	Cons
Can also calculate temperature and Dew point values

Home Page

holsoft.nl

holsoft.nl is another free online relative humidity calculator website. This website offers one of the simplest relative humidity calculators that only require normal temperature and wet-bulb temperature values to calculate relative humidity. However, it lacks information related to relative humidity and its calculation. Now, check out the below steps.

How to calculate relative humidity online using holsoft.nl:

Go to this website using the given link.
After that, enter the dry-bulb and wet-bulb temperatures in Celsius.
Next, click on the Calculate humidity button to view the relative humidity value.

Final Thoughts:

It is a very basic online relative humidity calculator website that helps users quickly find out the relative humidity in percentage.

Pros	Cons
	Lacks information related to relative humidity

Home Page

weather.gov

weather.gov is another free online relative humidity calculator website. This website offers multiple online calculators including a humidity calculator. This relative humidity calculator uses air temperature and dewpoint value as input to perform the calculation. However, it doesn’t explain relative humidity nor provides formulas to calculate it. Now, follow the below steps.

How to calculate relative humidity online using weather.gov:

Visit this website and access the Calculator section.
Now, choose Relative Humidity Calculator.
After that, enter Air Temperature and Dew Point Values.
Next, click on the Relative Humidity button to view the calculated value.

Additional Features:

This website has multiple tools like Temperature Conversion, Windchill Calculation, Heat Index Calculation, etc.

Final Thoughts:

It is another online relative humidity calculator website that anyone can use without hassle.

Pros	Cons
	Doesn’t offer information related to relative humidity

Home Page

Frequently Asked Questions

What is 100% relative humidity?

When the relative humidity is 100%, the air is holding the maximum amount of water vapor it can at a given temperature. This means that the air is fully saturated with moisture, and any additional moisture would result in condensation (like dew, fog, or clouds). It's essentially the point of saturation where the air can't hold any more water vapor, leading to the likelihood of precipitation or the formation of water droplets.

What is relative humidity at 50%?

When the relative humidity is 50%, the air is holding half of the maximum amount of water vapor it could hold at a given temperature. It indicates that the air is halfway to being fully saturated. At this level, the air is neither extremely dry nor very humid. It's often considered a comfortable range for many people, as it strikes a balance between being too dry or too damp.

Why do we calculate relative humidity?

Relative humidity is a crucial factor in weather forecasting. It influences the likelihood of precipitation and the formation of clouds. Understanding humidity levels helps meteorologists predict weather patterns and make more accurate forecasts. The level of humidity in the air can impact respiratory health. Very dry air can lead to dry skin, irritated eyes, and respiratory issues, while excessively high humidity can contribute to mold growth and other air quality problems.

What is the RH percentage?

Relative humidity (RH) is expressed as a percentage. It represents the amount of water vapor present in the air relative to the maximum amount the air could hold at its current temperature. So, when you see a value like "50% relative humidity," it means the air is holding half of the maximum moisture it could hold at that particular temperature. The percentage scale is used to communicate how close the air is to being fully saturated with water vapor.

What is the unit of RH?

Relative humidity (RH) is expressed as a percentage (%). It is a dimensionless quantity, as it represents the ratio of the actual amount of water vapor in the air to the maximum amount it could hold at a given temperature. So, you won't see units like grams per cubic meter or any other specific unit attached to relative humidity.

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