How to multiply columns in excel

To multiply columns in Excel, follow these steps:

1. Use a Formula to Multiply Two Columns
   A formula can multiply the values in two columns. For example, to multiply column A by column B:

   1. Click the first cell where you want the result, e.g., C1.

   2. Enter the formula:

      $=A1\ast B1$
      

   3. Press Enter.

   4. Drag the fill handle (small square at the bottom-right of the cell) down to apply the formula to all rows.

2. Multiply Entire Columns Using Array Formula
   Excel supports multiplying entire ranges at once:

   1. Select a blank column for the results.

   2. Enter the formula:

      $=A1:A10\ast B1:B10$
      

   3. Press Ctrl+Shift+Enter on Windows or Command+Shift+Enter on Mac to create an array formula.

3. Using the PRODUCT Function for Individual Rows or Cells
   The PRODUCT function multiplies numbers together. Example for one row:

   $=PRODUCT(A1,B1)$
   

   This returns the same result as =A1*B1.

4. Multiplying an Entire Column by a Single Number
   To multiply column A by a constant value, e.g., 10:

   1. Enter the constant in a cell, e.g., D1 = 10.

   2. Use the formula in column B:

      \(=A1*$D$1\)
      

   3. Drag the fill handle down to apply it to all rows.

5. Using Paste Special to Multiply Columns Without a Formula
   This method permanently changes the values:

   1. Enter the multiplier in a blank cell.

   2. Copy that cell.

   3. Select the range you want to multiply.

   4. Go to Home → Paste → Paste Special → Multiply → OK.

6. Tips for Accuracy

   • Ensure all cells contain numbers; text values will return errors.

   • Use $ in formulas for absolute references when multiplying by a constant.

   • Check for empty cells; Excel treats them as 0 in multiplication.

This method works for both Windows and Mac versions of Excel with minor differences in array formula entry: Ctrl+Shift+Enter on Windows, Command+Shift+Enter on Mac.