Earth Science & Energy
Dew Point Temperature from Relative Humidity & Ambient Air Temp
Calculate dew point temperature from relative humidity & ambient air temp using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Dew Point Temperature from Relative Humidity & Ambient Air Temp using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Magnus: Td = bγ/(a−γ), γ = ln(RH/100)+aT/(b+T)
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Magnus liquid-water dewpoint: γ=ln(RH/100)+17.625T/(243.04+T); Td=243.04γ/(17.625−γ), T and Td in°C.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Explicit Alduchov–Eskridge coefficient choice; use0<RH≤100 and its stated temperature range. Do not mix coefficients from other Magnus fits. Below-freezing ice/frost-point conventions differ; this fit is relative to liquid water.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Air temperature (°C) | Relative humidity (%) | Dew point |
|---|---|---|---|
| Worked example | 25 | 60 | 16.6977 °C |
| Half the amounts | 12.5 | 30 | -4.624 °C |
| Double the amounts | 50 | 100 | 50 °C |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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