Quick summary
The SUM function in Microsoft Excel lets you instantly calculate totals across a range of cells using the AutoSum button or a manual formula. This step-by-step demo walks you through the fastest way to add up numbers in any Excel spreadsheet.
Steps
- Open your Excel spreadsheet where you want to calculate the total.
- Click on the cell where you want the sum to appear.
- Locate the AutoSum (Σ) button in the ribbon and click it to apply the SUM formula.
- Press Enter to confirm, and the calculated sum will display in the selected cell.



