Formulas allow you to calculate results based on properties of your whole sequence. The most simple formula is one that refers to the current item using basic mathematical operators. For example, for a peak you can calculate the Area in seconds (Peak_Area*60).
Use all logical or mathematical functions to create complex formulas, for example to average a value only for certain sample names.
Use functions to access properties of other items, such as the Area of another peak in the same signal, injection, or sequence.
The Custom Calculation Editor proposes several functions and operators (items listed in the detail part of the CC Editor). Some aggregate functions have been adapted to make writing a formula easier; nevertheless you can use all Visual Basic functions or operators.