Relative Humidity Calculator

Relative Humidity (φ):

Partial pressure of water vapor (p_v):

Saturation pressure of water at the same temperature (p_vs):

How This Is Calculated

$$ \phi = \frac{p_v}{p_{vs}} \cdot 100 $$ where:

φ = Relative Humidity (%)

p_v = Partial pressure of water vapor (Pa)

p_vs = Saturation pressure of water at the same temperature (Pa)

Assumptions

Air and water vapor behave as ideal gases.
The system is in steady state.
Air and water vapour are in thermodynamic equalibrium.
The temperature distribution is uniform.

Related Calculators

Dew Point Temperature

Humidity (Mixing) Ratio

Specific Humidity