Test and Measurement World Measurements Section

One Stop For Your Test and Measurement Need

Humidity Ratio Calculator | Humidity Ratio Formula

This page covers Humidity Ratio Calculator and Humidity Ratio Formula. The calculator covers humidity ratio calculation by mass and by vapor partial pressure formula or equations.

Definition: The ratio of mass of water vapor present in the moist air with mass of dry air is known as humidity ratio of air. It can also be defined as follows.

Following are the two ways humidity ratio can be calculated.
➤By mass: It can be expressed using mass of water vapor present in humid air with mass of dry air.
➤By vapor partial pressure: It can be expressed using partial pressure of vapor in air with partial pressure of dry air.

Humidity Ratio Calculator by Mass

Following Humidity Ratio Calculator calculates humidity ratio using formula-1 provided below.

mass of water vapor, Kg (input1) :

mass of dry air, Kg (input2) :



Humidity ratio by mass (Output):


Example of humidity ratio calculator-1:
INPUTS : mass of water vapor = 100 , mass of dry air = 100
OUTPUTS: Humidity ratio (by mass) = 1 Kg/Kg


Humidity Ratio Formula by Mass

Following Humidity Ratio formula by mass is used for calculation in this calculator.


Humidity Ratio Formula by mass

Humidity Ratio Calculator by vapor partial pressure

Following Humidity Ratio Calculator calculates humidity ratio using formula-2 provided below.

Partial pressure of water vapor in moist air, Pa (input1) :

Atmospheric pressure of moist air, Pa (input2) :



Humidity ratio (Output):


Example of Humidity ratio calculator-2:
INPUTS : Vapor partial pressure (Pw) = 2222 Pa, Atmospheric pressure (Pa) = 102325 Pa
OUTPUTS: Humidity ratio (by vapor partial pressure) = 0.0138 Kg/Kg


Humidity Ratio Formula by vapor partial pressure

Following humidity ratio formula by vapor partial pressure is used for calculation in this calculator.


Humidity Ratio Formula by Vapor Partial Pressure

Useful converters and calculators

Temperature coefficient of resistance
Wire Resistivity calculator
Humidity ratio calculator
RAD to Gray conversion

Links to useful Measurements

Following are the links to other useful measurements available on Test and Measurement World website.
Difference between EVM vs subcarriers and EVM vs symbols
Current measurement vs Voltage measurement
Inductance measurement vs Capacitance measurement
Difference between Power and Energy measurements
EMC measurement vs EMI measurement
Electric and Magnetic Field Measurements

What is difference between or comparison between

Following links mention difference or comparison between various equipments:
comparison between VSG and VSA
DIfference between SNA ans VNA
Oscilloscope Bandwidth versus Rise time
Oscilloscope vs Logic Analyzer
Difference between Oscillscope types
Comparison between spectrum and network analyzer



Share this page

Translate this page

Latest Posts