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Dew Point Calculator — result sheet
Estimate dew point from Celsius air temperature and relative humidity with the Magnus approximation.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: gamma = ln(RH/100) + 17.27T/(237.7+T); dew point = 237.7gamma/(17.27-gamma).
The result is shown in both Celsius and Fahrenheit while keeping the input equation in Celsius.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Air temperature — C; minimum -80; maximum 60
- Relative humidity — %; minimum 1; maximum 100
Worked example
| Input | Value |
|---|---|
| Air temperature | 25 |
| Relative humidity | 60 |
The Magnus approximation estimates a dew point near 16.7 C.
Assumptions and limits
- Relative humidity is measured at the same place and time as air temperature.
- The Magnus equation is an atmospheric approximation, not a laboratory reference measurement.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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