75 F, 60% RH
- Celsius
- 15.6541840794 C
- Air temperature
- 75 F
- Humidity
- 60%
Dew Point Calculator
Enter air temperature and relative humidity to estimate dew point in Fahrenheit and Celsius, then compare dry, mild, and muggy examples.
Inputs explainedResult checksExample valuesRuns in your browser
Formula steps
- Convert Fahrenheit to Celsius.
- Use the Magnus approximation with temperature and relative humidity.
- Convert the dew point back to Fahrenheit for display.
Examples
Recent answers
Recent dew point calculations will appear here.
Dew point math stays local and uses temperature and relative humidity only.
Inputs and recent answers stay in this browser tab and are not sent to a server.
How to use the Dew Point Calculator
- Enter air temperature in Fahrenheit and relative humidity percent.
- Press Calculate dew point to estimate dew point in Fahrenheit and Celsius.
- Use dew point to understand moisture comfort better than relative humidity alone.
- Official forecasts and instruments can differ from this approximation.
What people use it for
Estimate dew point from weather readings.
Compare humidity comfort more clearly than relative humidity alone.
Convert dew point between Fahrenheit and Celsius.
Use with heat index for weather context.
Check indoor room moisture from a thermometer and humidity sensor.
Explain why the same relative humidity can feel different at different temperatures.
Quick examples
Mild humid day
75 F and 60% RHAbout 60.2 F dew point
Dry indoor air
70 F and 30% RHAbout 37.1 F dew point
Muggy evening
82 F and 75% RHAbout 73.3 F dew point
Very humid heat
90 F and 70% RHAbout 78.9 F dew point
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Dew Point CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Everyday ToolsBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Dew Point Calculator?
Use it when your task matches one of these common needs: Estimate dew point from weather readings. Compare humidity comfort more clearly than relative humidity alone. It works best when you already know the measurements, amounts, units, or options the page asks for.
What is the Dew Point Calculator doing with my inputs?
In plain language: The calculator converts Fahrenheit to Celsius, computes gamma = ln(RH / 100) + (17.625 x T_C) / (243.04 + T_C), solves dew point C = (243.04 x gamma) / (17.625 - gamma), then converts the result back to Fahrenheit. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.
What do the main Dew Point Calculator inputs mean?
Temperature F: the current air temperature in degrees Fahrenheit for the same place and time as the humidity reading. Relative humidity %: how close the air is to saturation at that temperature. Use 1 to 100; zero humidity is not valid for the formula. Dew point: the temperature where that air would reach 100% relative humidity if cooled without changing pressure or moisture content.
How should I read the Dew Point Calculator answer?
Read the headline answer, then check the smaller lines beside it. For everyday tools, those lines usually show the distance, time, cost, units, or setting that made the answer change.
What should I double-check before trusting the answer?
This browser estimate uses temperature and relative humidity at one moment. It is not a calibrated weather station, official forecast, indoor-air-quality report, mold-risk survey, or safety alert. Also check the unit, scale, mode, and result limit because small input changes can change the answer.
Why can dew point feel clearer than relative humidity?
Relative humidity changes when temperature changes. Dew point gives a more direct clue about how much moisture is actually in the air, so a higher dew point usually feels more humid.
What does 75 F and 60% relative humidity give?
With this calculator, 75 F and 60% relative humidity gives a dew point of about 60.2 F, or about 15.7 C. That is a mild-to-humid moisture reading, not an official forecast.
Can dew point be higher than the air temperature?
For normal relative humidity inputs from 1% to 100%, the dew point should be at or below the air temperature. At 100% relative humidity, the dew point equals the air temperature.
Is dew point the same as heat index?
No. Dew point is the moisture temperature where air reaches saturation. Heat index estimates how hot the air feels to people from temperature and humidity, so use the Heat Index Calculator for heat-stress context.
Can I use this for indoor comfort?
Yes, as a quick estimate if your room temperature and humidity readings are accurate. For mold, condensation, HVAC, storage, or health decisions, use proper instruments and professional guidance.
Why does very low humidity make a low or negative dew point?
Very dry air has little water vapor, so it would need to cool much farther before reaching saturation. That can push the estimated dew point well below the current air temperature.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.