How to Convert mm to in Excel: A Step-by-Step Guide

Converting millimeters to inches in Excel is a pretty straightforward task. You just need to know the right formula and where to put it. In a nutshell, you divide the number of millimeters by 25.4 to get the equivalent in inches. Once you’ve got that formula down, you’ll be converting measurements like a pro in no time!

Step by Step Tutorial: Converting mm to Inches in Excel

Before we dive into the steps, let’s make sure we’re on the same page. The steps below will show you how to apply a simple mathematical formula to convert millimeters to inches in Excel. With this knowledge, you can easily handle conversions for all sorts of projects, whether you’re working on a school assignment or a professional task.

Step 1: Open Excel and Select a Cell

Choose the cell where you want the converted measurement to appear.

When you open Excel, you’ll see a grid of cells. Click on the one where you want to display your converted measurement. It’s best to choose a cell that’s close to the original millimeter value for easy reference.

Step 2: Enter the Conversion Formula

Type “=A1/25.4” into the cell, replacing “A1” with the cell that contains the millimeter value.

The formula “=A1/25.4” is what will perform the magic. If the millimeter value is in cell B3, you would write “=B3/25.4”. This formula divides the number of millimeters by 25.4, which is the number of millimeters in an inch.

Step 3: Press Enter

Hit the enter key to apply the formula and see the result.

After typing the formula into the cell, press enter. Excel will calculate the conversion and the cell will display the measurement in inches. If you’ve done everything right, you should see a smaller number, because there are more millimeters than inches in the same length.

Step 4: Copy the Formula for Multiple Conversions

Use the fill handle to drag the formula down to other cells if you need to convert more than one measurement.

If you’ve got a whole list of measurements to convert, there’s no need to repeat steps 2 and 3 for each one. Simply click on the cell with your formula, find the little square in the bottom right corner, and drag it down to fill other cells. This copies the formula, adjusting for each new row automatically.

After you complete these steps, you’ll have successfully converted millimeters to inches using Excel. The converted measurements will be displayed in the cells where you entered the formula. If you need to convert more values, just repeat the steps or use the fill handle as described in step 4.

Tips for Converting mm to Inches in Excel

  • Remember that 1 inch equals 25.4 millimeters.
  • Double-check the cell reference in your formula to make sure it’s pointing to the correct location.
  • Use the fill handle to quickly apply the formula to multiple cells.
  • Format the cells with the converted values to two decimal places for a more precise measurement.
  • If you’re working with fractional inches, you may want to convert to decimal inches for easier use in Excel.

Frequently Asked Questions

Can I convert inches to millimeters in Excel?

Yes, you can convert inches to millimeters by multiplying the number of inches by 25.4.

Do I need to use any special Excel functions to convert mm to inches?

No, you don’t need any special functions. A simple division formula will do the trick.

What if my measurements are in a different unit, like centimeters?

If your measurements are in centimeters, you can convert them to millimeters by multiplying by 10, and then use the method above to convert to inches.

Can I convert multiple measurements at once?

Yes, by using the fill handle, you can apply the conversion formula to as many cells as you need.

How can I ensure my conversions are accurate?

Make sure you’re using the correct formula and cell references, and double-check your work for errors.


  1. Open Excel and select a cell.
  2. Enter the conversion formula.
  3. Press enter to apply the formula.
  4. Copy the formula for multiple conversions.


Converting measurements from millimeters to inches in Excel doesn’t have to be a headache. With the simple steps we’ve outlined, you can make quick work of any conversion task. Remember to use the formula “=A1/25.4”, replacing “A1” with the cell containing the millimeter value, and press enter to see the conversion. If you’re dealing with multiple measurements, the fill handle is your best friend.

Whether you’re a student, a professional, or just someone who loves DIY projects, knowing how to convert mm to in Excel is a handy skill that can save you time and reduce errors in your work. So go ahead, give it a try, and watch those millimeters transform into inches with just a few clicks. And if you’re ever in doubt, remember that Excel is more than a spreadsheet program; it’s a powerful tool that can simplify many aspects of your work, including unit conversions. Now, go out there and convert like a pro!

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