The calculator is an application for the simplest mathematical calculations. Control is the same as on the usual calculator, in the current version it only works with whole numbers. The currently used operator will turn yellow. Button  C  deletes the entire calculation, button  <-  only the last digit from the entry or result.

When defining a custom screen, it is possible to place a module with a Calculator button on it. Zooming in on this module (touching on it) will display this Calculator application.