Calculator of Air is a straightforward tool for quick calculations using "Psychrometric Charts" to determine humidity-related values. This iPhone app simplifies the process of calculating humidity, dew point temperature, and more by supporting six essential parameters such as dry bulb temperature and relative humidity. By inputting any two parameters and tapping "ENTER," the app automatically computes the remaining values. Additionally, users can access more features by combining it with the sister app "HumidCalc," offering additional functionalities since version 1.0.7.

The input range for temperature spans from ℃ to 99.97 ℃ (-459.67 ° F to ° F), for humidity ratio from 0 kg/kg to 1 kg/kg (0 lb/lb to 1 lb/lb), and for relative humidity from 0 %RH to 100 %RH. The app provides error alerts for abnormal inputs and allows users to toggle between Celsius and Fahrenheit temperature units, as well as enable or disable Click-Sound as per preference.