how to use formulas in excel

Create a formula that refers to values in other cells

Select a cell.
Type the equal sign =.

Note: Formulas in Excel always begin with the equal sign.
Select a cell or type its address in the selected cell.
Enter an operator. For example, – for subtraction.
Select the next cell, or type its address in the selected cell.
Press Enter. The result of the calculation appears in the cell with the formula.

Select an empty cell.
Type an equal sign = and then type a function. For example, =SUM for getting the total sales.
Type an opening parenthesis (.
Select the range of cells, and then type a closing parenthesis).
Press Enter to get the result.

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