Select the cell where you want the result
Type =
Enter the formula using cell references, operators, and functions
Example: =A1+B1
Example: =SUM(A1:A10)
Press Enter
Use parentheses to control calculation order
Use cell references instead of typing values directly when possible
Copy formulas by dragging the fill handle or using copy and paste
Use absolute references with $ when needed, such as $A$1
Check for errors if the formula does not calculate correctly