Select the cell where you want the result to appear
Type = to begin the formula
Enter the cell references, numbers, operators, or functions you want to use
Press Enter to calculate and display the result
Use the formula bar if you prefer to type or edit the formula there
Start every formula with =
Use parentheses to control the order of calculations
Use cell references instead of typing values directly when possible
Copy formulas to other cells by dragging the fill handle
Edit a formula by double-clicking the cell or using the formula bar