Psychrometric Calc is an app useful for HVAC professionals, building engineers, air quality engineers, and anyone else that needs to calculate the properties of a moist air environment, such as pressure, humidity, dew point, and temperature. It can also calculate the enthalpy and volume of the air. It is based on the ASHRAE formula and includes many of the most common values used in the industry.

ASHRAE is a non-profit organization responsible for setting the standards and guidelines for the HVAC industry. They have set a goal to provide tools and information that will help the industry to be more efficient and improve the quality of life. This is why they have created this formula and this app.