Formulas are Excel's most powerful aid for getting your work done. Excel formulas handle the mathematical chores in your worksheet. In its simplest form, a formula is a quick calculation, similar to one you'd make on a calculator or adding machine. However, you can also use a formula to make predictions, figure out a car payment, or perform some other complex task.
Formulas? The way Excel performs calculations in your worksheets. Another way to describe Excel formulas is to call them "equations."
Formulas speed up the creation of your worksheets. You don't need to worry about whether a calculation is correct, because Excel doesn't make mistakes. Best of all, you can change any value contained in a formula, and Excel will update the results automatically.