How to Measure Laptop Size for Bag: A Detailed Tutorial

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If you’re looking to buy a new laptop bag from online stores, the first thing you need to know what is the size of your laptop.

It’s important for you to know how to measure laptop size for bag because you don’t want to waste your money on buying the wrong size of laptop bag that later cannot fit for your device.

The best way to measure your actual laptop size is by measuring diagonally across the laptop with your tape. The measurement is including the bezel, the casing that surrounds the screen.

In this tutorial, I’ll show you step by step on how to measure laptop size for bag so that you can always choose the right size bag for your laptop.

Things to Know Before Start Measuring

First thing first, before you start to measure your laptop, you need a measuring tape or ruler. Secondly, of course, your laptop.

In this tutorial, I assume that you already know how to read the measuring units on your tape. 

The standard measurement unit that we use is in inches. However, some people like to measure it in centimeters. 

It doesn’t matter which one do you choose, but for this tutorial, all my measurement are in inches.

The scale factor of inches on your measuring tape is 1:8. For example:
1.0″, 1.1″, 1.2″, 1.3″, 1.4″, 1.5″, 1.6″, 1.7″, 2.0″, 2.1″,……

You can use this calculator if you need to convert it in centimeters.

Now let’s get started!

How to Measure Your Laptop Size for Bag

As mentioned earlier, the ideal way to measure your laptop size is by measuring diagonally across the laptop; edge to edge. 

However, you also need to measure the width, the height and the depth of your laptop.

Some bags like backpack has a vertical section (from North to South) whereas a messenger bag or a sleeve has a horizontal section (from West to East). 

Knowing these extra dimensions will surely help you to decide on your purchase.

Measuring the diagonal

To measure the actual diagonal length of your laptop, place your measuring tape at the corner of your laptop and stretch the tape across to the bottom end of the corner. I show you in the illustration below:

Measuring the diagonal laptop
As you can see from the picture above, I measure it from the top corner of the bezel to the bottom edge of the bezel (diagonally). In this case, the length is 15.5 inches (39.37 cm) long.

When you measure, please ignore the screen size of the laptop because we want to get to the actual size of the dimension. 

My HP laptop screen is 14 inches long, but the overall size is larger due to trim around it.

Now, you’ve got the diagonal length of your laptop. Write it down.

Measuring the Width (Length)

We have covered the measurement of the diagonal dimension. Now let’s move on to the next step; measure the width. 

To measure the width, place your measuring tape at the bottom left corner of the laptop and drag it to the bottom right of the laptop.

Measuring the width laptop

From the picture above, the width of my laptop measures about  13.05 inches (33.15 cm) long. Once you get your width, write it down.

Measuring the Height

To get an accurate measurement of height, you need to close your laptop fully. 

Take your measuring tape and from the side of the laptop, measure the height by placing the ruler at the bottom and the top of the laptop.

Measuring the height laptop

The height of my laptop measures about 2 inches (5.08 cm) high. The height of the laptop is not as important as other dimensions mentioned earlier because rarely the laptop manufacturer makes the laptop thicker than 2 inches high.

They want to make the laptop as light as possible.

Measuring the Depth

Now to measure the depth of your laptop, place your measuring tape at the top right side of your laptop and drag it to the bottom side of the laptop.

Measuring the depth laptop

The depth of my laptop measures about 9.1 inches (23.11 cm). This is the depth of your laptop and writes it down.

Tips on How to Buy a Laptop Bag Online

If you plan to purchase a laptop back from online stores, you can use the measurement that you got from your laptop. 

For example, if you’re looking for a laptop backpack, you need to look at the length and the width of the bag because of the laptop sit vertically from North to South.

Now from our lesson earlier, you should use the measurement of the width and the depth of your laptop.

The width measurement that you have is the same as the length of the backpack. Same goes to the depth measurement, that is equivalent to the width of the laptop backpack.

Likewise, if you’re planning to buy a laptop messenger bag or a tote, it is straight forward because the dimension of these type of laptop bags are horizontally (West to East). 

So take the width measurement as the horizontal dimension and the depth measurement as the height dimension of the laptop messenger bag.

Choosing a wrong size of laptop bag can harm your laptop because your laptop may not able fit properly inside the bag.

If you have 14 inches size of laptop but keep it in a larger backpack, the laptop section compartment may not able to hold and protect your laptop due to too much space.

Laptop Bag Size Guideline

I have created the laptop size guideline table for your reference below. Please do remember to take the diagonal measurement of your laptop and compare to the details on the listing.

You need to add extra inches (or centimeters) to that measurement to fit the outside material surrounding the laptop.

Convert the measurement values from inches to centimeters if necessary because some online retailer will include the cm units in their listing.

Please refer the table below for the right size:

Swipe the table!

Diagonal laptop (inch) Diagonal laptop (cm) Size Laptop Bag to Choose (inch) Example of Laptops Can Be Fit In
11" 27.94 cm 11" MacBook Air 11
12" 30.48 cm 12" MacBook 12 inch
12.5" 31.75 cm 12" Xiaomi Air 12.5 inch laptop
13.3" 33.78 cm 13" MacBook 13 inch
14.1" 35.81 cm 14" Any Windows 14.1-inch laptop
14.6" 37.08 cm 14" Any Brand 14.6-inch laptop
15" 38.10 cm 15" MacBook Pro 15.4 inch laptop
15.6" 39.62 cm 15" Any Brand 15 - 15.6-inch laptop
17.3" 43.94 cm 17" Any 17.3-inch laptop

Disclaimer: The table above is just a general guideline.


Now you have learned everything you need to know on how to measure the laptop size for bag. It is a straightforward process. 

If you follow those steps mentioned above, you will find selecting the right laptop bag is not a difficult task.

Make sure you have two different units of measurement; inches, and centimeters because some seller will use different units of dimension in their listing. 

I hope this guide will help you choose the right bag for your laptop.

Happy Measuring!

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Joe is an engineer by profession who spends as much time in front of a laptop screen when he is not working. His mission is to make this website very useful and helpful by sharing some tips and guides that could help you to find your best laptop bag, accessories and related stuff.

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