If Checkbox

Hey everybody,

I´m trying to create my first calculated form using “numbers” as fields to get a solution in a “calculated field”. I would like to connect a calculation to a checkbox, but I can´t find a solution for using it in if-condition – my developing English is not good to find a solution on myself.

Example:
IF fieldname5(checkbox)=”checked”
then fieldname2
else fieldname2-fieldname3

What is the value that I need to check?
It would be great if someome can explain me the solution for my calculation using this plugin.

Many thanks from Germany!

Tobi