Use the SUM function: `=SUM(A1:A10)`
Select the cell where you want the total
Type `=SUM(` and highlight the range of cells
Press Enter to calculate the total
Use AutoSum by clicking the `Σ` button
Select the cells above or beside the total cell
Press Enter to insert the total automatically
Add non-adjacent cells with `=SUM(A1,A3,A5)`
Include multiple ranges with `=SUM(A1:A5,C1:C5)`
Use the status bar to see a quick total after selecting cells
Copy the formula to total other rows or columns
Use `=SUBTOTAL(9,A1:A10)` for filtered data
Use `=SUMIF(range, criteria, sum_range)` for conditional totals
Use `=SUMIFS(sum_range, criteria_range1, criteria1)` for multiple conditions