Dewpoint & Relative Humidity Calculator

Calculate dewpoint temperature and relative humidity from air temperature using the Magnus formula. Includes frost point at sub-zero temperatures.

 
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Physical Constants Reference
ConstantSymbolValue
Speed of lightc2.99792458×10⁸
Planck's constanth6.62607015×10⁻³‴
Boltzmann constantkʙ1.380649×10⁻²³
Avogadro's numberNₐ6.02214076×10²³
Gravitational constantG6.6743×10⁻¹¹
Gas constantR8.31446
Elementary chargee1.602176634×10⁻¹⁹
Electron massmₑ9.1093837015×10⁻³¹
Proton massmₚ1.67262192369×10⁻²⁷
Fine-structure constantα7.2973525693×10⁻³
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Formula Definitions

The Dewpoint & Relative Humidity Calculator works by applying a well-defined formula to the values you enter. Understanding the formula behind the calculation helps you interpret the result and check that your inputs are correct. Below we break down the key components that drive the Dewpoint.

The core formula used by this calculator is:

Result = f(physical quantities, constants, conditions)

Each variable in the formula has a specific meaning:

  • physical quantities — Measured values with units entered into the Dewpoint.
  • constants — Physical or chemical constants (e.g. CODATA values, gas constant, Avogadro's number).
  • conditions — Temperature, pressure, concentration, or environmental state of the system.
  • Result — Computed physical or chemical quantity with associated units.

Note: Compare results with standard reference values or published experimental data.

How to Use This Calculator

  1. Enter the physical or chemical quantities. Enter the physical or chemical quantities with correct units into the Dewpoint & Relative Humidity Calculator input fields.
  2. Verify conditions. Verify or adjust the conditions such as temperature, pressure, concentration, or environmental parameters.
  3. Apply the scientific formula. Press Calculate to apply the scientific formula or physical law.
  4. Compare with reference values. Review the result and compare it with standard reference values, CODATA constants, or published experimental data.

Glossary and Definitions

Physical quantity
A measurable property of a physical system, expressed as a numeric value with units.
Constant
A fixed, well-defined value (e.g. a CODATA constant) used across scientific calculations.
Significant figures
The digits in a measurement that carry meaning, reflecting the precision of the instrument.
Reference value
A published standard or experimental value used to validate a calculated result.
Dewpoint calculator
A key concept referenced by the Dewpoint: Calculate dewpoint temperature and relative humidity from air temperature using the Magnus formula. Includes frost point at sub-zero temperatures.
Relative humidity calculator
A key concept referenced by the Dewpoint: Calculate dewpoint temperature and relative humidity from air temperature using the Magnus formula. Includes frost point at sub-zero temperatures.
Magnus formula
A key concept referenced by the Dewpoint: Calculate dewpoint temperature and relative humidity from air temperature using the Magnus formula. Includes frost point at sub-zero temperatures.
Humidity dewpoint
A key concept referenced by the Dewpoint: Calculate dewpoint temperature and relative humidity from air temperature using the Magnus formula. Includes frost point at sub-zero temperatures.

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Frequently Asked Questions