Two calculators for determining equilibrium moisture values corresponding to selected A_w values using the Guggenheim–Anderson–de Boer (GAB) model and  the Brunauer-Emmett-Tellet (BET) model have been added.

To use the models, the constants for the product concerned must be inputted. Selected A_w values are then added. The calculator will then calculate the equilibrium moisture content for each value and plot it against A_w, to give a sorption or desorption isotherm.