You can use formulas in Excel and other spreadsheet programs to add, subtract, multiply, and divide. Use simple Excel formulas to also make cell references.

Rather than typing cell addresses manually, you can **point and click** on the cells you want to include in your formula. This method can save a lot of time and effort when creating formulas. In our example below, we'll create a formula to calculate the cost of ordering several boxes of plastic silverware.

- Select the
**cell**that will contain the formula. In our example, we'll select cell**D3**.Selecting cell D3 - Type the
**equals sign (=)**. - Select the
**cell**you want to reference first in the formula: cell**B3**in our example. The**cell address**will appear in the formula, and a**dashed blue line**will appear around the referenced cell.Referencing cell B3 - Type the
**mathematical operator**you want to use. In our example, we'll type the**multiplication sign (*)**. - Select the
**cell**you want to reference second in the formula: cell**C3**in our example. The**cell address**will appear in the formula, and a**dashed red line**will appear around the referenced cell.Referencing cell C3 - Press
**Enter**on your keyboard. The formula will be**calculated**, and the**value**will be displayed in the cell.The completed formula and calculated value

Formulas can also be **copied** to adjacent cells with the **fill** **handle**, which can save a lot of time and effort if you need to perform the** same calculation** multiple times in a worksheet. Review our lesson on Relative and Absolute Cell References to learn more.

Copying a formula to adjacent cells using the fill handle

Sometimes you may want to modify an existing formula. In the example below, we've entered an incorrect cell address in our formula, so we'll need to correct it.

- Select the
**cell**containing the formula you want to edit. In our example, we'll select cell**B3**.Selecting cell B3 - Click the
**formula bar**to edit the formula. You can also**double-click**the cell to view and edit the formula directly within the cell.Selecting a formula to edit - A
**border**will appear around any referenced cells. In our example, we'll change the second part of the formula to reference cell**B2**instead of cell**C2**.The misplaced cell reference - When you're finished, press
**Enter**on your keyboard or click the**checkmark**in the formula bar.Editing a formula - The formula will be
**updated**, and the**new value**will be displayed in the cell.The newly calculated value

If you change your mind, you can press the **Esc** key on your keyboard to avoid accidentally making changes to your formula.

To show all of the formulas in a spreadsheet, you can hold the **Ctrl** key and press **`** (grave accent). The grave accent key is usually located in the top-left corner of the keyboard. You can press **Ctrl+`** again to switch back to the normal view.