What is the Dew Point Calculator?
Calculate dew point from temperature and relative humidity (Magnus formula). These physics and science calculators apply standard SI formulas with exact constants (such as g = 9.80665 m/s² and the 2019 SI definitions) for students, engineers and curious minds.
How to use the Dew Point Calculator
- Enter your temperature, your relative humidity.
- Results update automatically as you type; you can also press Calculate.
- Read the output: dew point, in fahrenheit.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With temperature = 25 °C, relative humidity = 60 %, the Dew Point Calculator returns dew point: 16.69 °C; in fahrenheit: 62.05 °F.
Tips for better results
- Convert inputs into SI units first for the cleanest results.
- Idealized formulas ignore friction and air resistance unless stated.
- Use our unit converters to switch between metric and imperial results.
Frequently asked questions
What does the Dew Point Calculator do?
Calculate dew point from temperature and relative humidity (Magnus formula).
How is it calculated?
The Dew Point Calculator uses this method: Td = b·γ ÷ (a − γ), γ = ln(RH) + aT ÷ (b + T).
Can you show an example?
With temperature = 25 °C, relative humidity = 60 %, the Dew Point Calculator returns dew point: 16.69 °C; in fahrenheit: 62.05 °F.
Is the Dew Point Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Dew Point Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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