How to Measure A Laptop Size for A Bag: A Detailed Tutorial

If you’re looking to 

buy a new laptop bag from online stores or sew your own laptop caseThe size of your laptop is the first thing you should know.

You should know how to measure a laptop size for a bag because you don’t want to waste money on a laptop bag that won’t fit your device later.

The best way to measure
The bezel, or casing that surrounds the screen, is included in the measurement. By measuring diagonally across the laptop with your tape, you can determine the size of your laptop.

So, how do you measuring your laptop?

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

Things to Know Before Measuring Your Laptop

Then there’s your laptop, of course. First and foremost, you’ll need a measuring tape or ruler before you begin measuring your laptop.

I’m assuming you already know how to read the measuring units on your tape in this tutorial.

We use inches as our standard measurement unit. Some people, however, prefer to measure it in centimeters.

It doesn’t matter which one you choose, but all of my measurements in this tutorial are in inches.

Note: Your measuring tape’s inches scale factor 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′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5′′, 2.5

If you need to convert it to centimeters, use the calculator below.

Now let’s get started!

How to Measure A Laptop Size for Bag

As previously stated, the best way to determine the size of your laptop is to measure diagonally across it from edge to edge.

However, you must also take measurements of your laptop’s width, height, and depth.

A backpack, for example, has a vertical section (running north to south), whereas a messenger bag or sleeve has a horizontal section (running west to east).

Knowing these additional dimensions will undoubtedly aid you in making your purchase.

Measuring the Diagonal

Place your measuring tape at the corner of your laptop and stretch it across to the bottom end of the corner to determine the actual diagonal length.

I show you in the illustration below:

As you can see in the image above, I take my measurements diagonally from the top corner of the bezel to the bottom edge of the bezel.

The length in this case is 15.5 inches (39.37 cm).

Please disregard the laptop’s screen size when measuring because we want to get to the true size of the dimension.

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

Now you know how long your laptop’s diagonal is. Make a note of it.

Measuring the Width (Length)

Let’s move on to the next step, which is to determine the width. We’ve gone over how to measure the diagonal dimension.

Place your measuring tape at the bottom left corner of the laptop and drag it to the bottom right corner to determine the width.

Make a note of your width once you’ve determined it. My laptop’s width, as seen in the image above, is approximately 13.05 inches (33.15 cm).

Measuring the Height

Close your laptop completely to get an accurate height measurement.

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

My laptop’s height is approximately 2 inches (5.08 cm).

Because laptop manufacturers rarely make laptops thicker than 2 inches high, the height of the laptop is not as important as the other dimensions mentioned earlier.

They want the laptop to be as lightweight as possible.

Measuring the Depth

To measure the depth of your laptop, start at the top right corner and drag your measuring tape to the bottom.

This is the depth of your laptop, which you should write down. My laptop has a depth of about 9.1 inches (23.11 cm).

How to Use Measure in iOS 12 (or the most recent update)

With the iOS 12 update, there’s a new app called Reminders that comes pre-installed on iOS devices. You probably don’t need a ruler to measure a laptop if you have an iPhone. Measure.

If you haven’t updated your iPhone in a while, please do so.update it first in order to use this app.

Note: If you have an Android phone, you can get the measure app from Google Play.Google Play on your phone. 

To learn how to use the Measure app to measure length and dimensions, as well as the level feature, please watch this video.

The following is a step-by-step guide to using the app to measure:

  • Step 1: Launch the Measure app on your iPhone.
  • Step 2: Swipe your iPhone around until this circle appears on the screen. On your screen, you’ll see some instructions telling you to move your iPhone around so the app can do a quick scan of your surroundings.
  • Step 3: Then, in the middle of your screen, move your device around to get the starting point for what you want to measure.
  • Step 4Tap the Undo button in the top left corner to try again if you make a mistake. : To add a point, tap the plus sign at the bottom.
  • Step 5After that, a measurement will appear along the line you drew. : Next, move your iPhone over to the middle of your screen, where the endpoint of the line you’re measuring appears, and tap the plus icon once more to end the line. If you’re trying to measure the dimensions of something, you can create multiple line measurements at once.
  • Step 6To clear all of your measurements and start over, tap Clear in the top right corner. To see conversions to other units of measurement, tap a measurement.

Keep in mind that the Measure app’s measurements aren’t always accurate. As a result, measuring with a measuring tape is probably still the most accurate method.

How to Buy a Laptop Bag on the Internet

You can use the measurements from your laptop if you plan to buy a laptop back from an online store.

For example, if you’re looking for a laptop backpackBecause the laptop sits vertically from North to South, you must consider the bag’s length and width.

You should now use the width and depth measurements of your laptop from our previous lesson.

The depth measurement, which is equivalent to the width of the laptop backpack, is the same. The width measurement you have is the same as the backpack’s length.

Similarly, if you want to buy a laptop messenger bag or tote, it’s simple because the dimensions of these types of laptop bags are horizontal (from West to East).

As a result, the horizontal dimension of the laptop messenger bag is the width, and the vertical dimension is the depth.

Choosing the incorrect laptop bag size can cause damage to your laptop because it may not fit properly inside the bag.

If you have a 14-inch laptop and carry it in a larger backpack, the laptop section compartment may not be large enough to hold and protect it.protect your laptop due to too much space.

Laptop Bag Size Guideline

Here are some of the most frequently asked questions about what size laptop bags will fit:

For a 15.6-inch laptop, what size laptop bag do I need?

For a 15.6-inch laptop, what size laptop sleeve should I get?

Is it possible to fit a 15.6-inch laptop into a 15-inch case?

Is it possible to carry a 17-inch laptop in a 15-inch bag?

What size laptop backpack do I require?

What is the width of the laptop?

It’s difficult to give you an exact answer because it depends on the bags’ sizes, dimensions, and designs.

Different manufactures have their own measurement guidelines.

Every bag specifies the maximum laptop size that can be accommodated.

As a result, I’ve created a laptop size guideline table for your convenience.

Remember to measure the diagonal length of your laptop and compare it to the specifications on the listing.

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

If necessary, convert the measurement values from inches to centimeters because some online retailers will list the cm units.

Please refer to the table below to determine the appropriate size:

Diagonal laptop (inch)
Diagonal laptop (cm)
Size Laptop Bag to Choose (inch)
Example of Laptops Can Be Fit In
27.94 cm
MacBook Air 11
30.48 cm
MacBook 12 inch
31.75 cm
Xiaomi Air 12.5 inch laptop
33.78 cm
MacBook 13 inch
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 only intended to serve as a general guideline.


You now know everything there is to know about measuring the laptop size for the bag. It’s a simple procedure to follow.

Selecting the right laptop bag is not difficult if you follow the steps outlined above.

Because some sellers will use different units of measurement in their listings, make sure you have two different units of measurement: inches and centimeters.

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

I really appreciate it! Please feel free to share this article if you found it useful.

Happy Measuring!