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Calculators / Science / Dew point
Dew point calculator
Estimate dew point from Celsius temperature and relative humidity.
On this page
Estimated dew point16.7°C
Calculator controls
How to calculate
Estimate dew point from Celsius temperature and relative humidity.
Estimated dew point = 243.04*(ln(humidity/100)+17.625*temp/(243.04+temp))/(17.625-(ln(humidity/100)+17.625*temp/(243.04+temp)))
Worked example
Air temperature (°C): 25; Relative humidity (%): 60.
Estimated dew point: 16.7 °C.
Assumptions and limits
This Magnus approximation is most accurate over common atmospheric conditions.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate dew point from Celsius temperature and relative humidity. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the dew point to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Air temperature (°C) | Enter a number of at least -80 and no more than 80. |
| Relative humidity (%) | Enter a number of at least 0.1 and no more than 100. |
Frequently asked questions
What should I check before using the dew point result?
This Magnus approximation is most accurate over common atmospheric conditions.
Is this dew point result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.