How to Measure Laptop Size: A Simple Guide for Buying and Upgrading

Knowing how to measure laptop size is important when you want a new laptop bag, a protective sleeve, or when comparing models before buying. Many people think laptop size is the width of the computer, but the number you see in laptop names, like 14-inch or 15.6-inch, actually refers to the screen size. In this friendly guide, you will learn the right way to measure a laptop and how to find the size using the model number.

Measuring a laptop may look tricky at first, but it is very simple once you know the correct steps. All you need is a ruler or measuring tape and a few minutes. By following the instructions below, you can get the most accurate screen measurement and make better buying choices.

What You Need Before You Start

You won’t need any special tool or tech skill. Just make sure you have: 

• A ruler or flexible measuring tape

• A flat surface to place the laptop on

A notebook or phone to record the measurement is also handy.

The Correct Way to Measure Laptop Screen Size

The most important thing to remember is this: the laptop size is measured diagonally across the screen only, from one inner corner to the opposite inner corner. You do not include the outer frame, also called the bezel.

Here is a simple step-by-step method:

1. Close and flatten the laptop

Make sure your laptop is turned off, and then open it so the screen lies flat or is open wide enough to measure easily. This helps you avoid bending the tape.

2. Find the starting point

Place the end of the measuring tape at the bottom-left inside corner of the actual display area. Avoid the black frame around the screen.

3. Measure diagonally

Pull the tape across to the top-right inside corner. Keep the tape straight in a line from corner to corner.

4. Read and record the size

Check the number in inches, because screen sizes are almost always listed in inches. This number is the laptop screen size.

Most laptops fit into common size categories. Here is a quick table to help you see where yours might belong:

Screen Size (Inches)	Best For	Notes
11–13 inches	Travel, school, light work	Very portable and lightweight
14–15.6 inches	Everyday use and work tasks	Most popular sizes
16–17 inches	Gaming, creative work, movies	More viewing space but heavier to carry

This method ensures you have the true screen size, not just the full body dimensions.

Also read: How to Size Golf Clubs

Checking Laptop Size Using the Model Number

If you do not want to measure by hand, you can still find the laptop screen size quickly by checking the model information. Many users prefer this method because it avoids mistakes.

Find your laptop’s model number

You can usually locate the model number on a sticker on the bottom of the laptop. If it is not visible there, you can check the system information inside your computer settings.

Look up the model online

Go to a search engine and type your model number followed by words like “screen size” or “specs.” Official product pages or trusted tech sites will list the full display measurement.

This method is helpful when you don’t have a measuring tape nearby or want to double-check the size before buying accessories.

Common laptop sizes explained

These are the most popular screen sizes:

• 13.3-inch → Highly portable

• 14-inch → Balanced for work and school

• 15.6-inch → Most common for everyday use

• 17.3-inch → Large, great for graphics and games

Each size changes how the laptop feels and performs.

Screen Size vs. Overall Laptop Dimensions

Sometimes people confuse the diagonal screen measurement with the physical size of the device. While the screen may be 15.6 inches, the laptop body can be larger due to the keyboard, speakers, and frame.

To get complete laptop dimensions:

• Measure width (side to side)

• Measure height (front to back with lid closed)

These extra numbers are useful for fitting a laptop sleeve or backpack.

Helpful Tips for Accurate Laptop Size Measurements

When learning how to measure laptop size, keep these short reminders:

• Always measure the screen only, not the bezel

• Confirm the result online to be extra sure

If the number lands between two sizes, round it to the nearest standard measurement. For example, 15.4 inches usually means a 15.6-inch laptop.

Final Thoughts

Measuring a laptop is quick and important for choosing the best accessories, planning upgrades, or comparing models before buying. Whether you pick the manual method or look up the model number online, you will get a clear and accurate size.

Now that you know how to measure laptop screen size, you can shop with confidence and pick the right laptop for your needs.