The fastest way: check your laptop's original box or manual

Your laptop's screen size is printed on the box it came in, usually on the back or side panel. Look for a number followed by inches — typically 13, 14, 15, or 17 inches for most laptops. If you still have the manual or documentation that came with your laptop, the screen size appears there too, often in a specifications section.

If you've kept the receipt or confirmation email from your purchase, that document usually lists the screen size as well. This is the most reliable method because manufacturers measure screen size the same way across all their products.

Key Takeaways

  • Your laptop's original box, manual, or purchase receipt will show the exact screen size in inches.
  • You can measure the screen diagonally from corner to corner with a ruler or measuring tape to find the size yourself.
  • Windows and Mac both have built-in settings where you can find your screen resolution, which sometimes hints at the screen size.
  • Manufacturer websites let you search by model number to find the complete specifications, including screen size.

Measure the screen yourself with a ruler

Screen size is measured diagonally from the bottom-left corner to the top-right corner of the display — not the width or height alone. Place a ruler or measuring tape at one corner and stretch it to the opposite corner. Write down the measurement in inches.

This method works but is less precise than checking documentation, because screen sizes are rounded to the nearest inch. A screen that measures 13.3 inches diagonally is sold as a 13-inch laptop. If your measurement falls between two standard sizes, round down to the nearest whole number — that's likely your screen size.

Find your screen size through Windows settings

Open Settings and go to System, then Display. You'll see your screen resolution listed — something like 1920 x 1080 or 2560 x 1440. Resolution alone doesn't tell you the screen size, but combined with your laptop model, it narrows things down.

To find your laptop model, right-click the Windows logo in the bottom-left corner and select System. Look for "Device name" or "Model" — this is usually something like "Dell XPS 13" or "HP Pavilion 15". Once you have the model name, search for it online along with the word "specifications" to find the exact screen size from the manufacturer.

Find your screen size on Mac

Click the Apple menu in the top-left corner and select About This Mac. Under the Displays tab, you'll see your resolution listed. Like Windows, the resolution alone doesn't reveal screen size, but it helps narrow down your model.

Your Mac model appears at the top of the same window — for example, "MacBook Pro 14-inch" or "MacBook Air 13-inch". Apple includes the screen size directly in the model name, so you have your answer right there. If you see only "MacBook Pro" without a size, search for your specific model year online to find the screen size.

Look up your laptop model on the manufacturer's website

Once you know your laptop model, visit the manufacturer's official website — Dell, HP, Lenovo, Apple, Asus, or whoever made your laptop. Use their search bar to find your exact model. The specifications page will list screen size, resolution, and other details.

This method is reliable because manufacturers keep detailed specifications for every model they've ever sold. If you can't find your exact model, try searching for the model number instead of the model name — the number is usually printed on a sticker on the bottom of your laptop.

Check the sticker on the bottom of your laptop

Flip your laptop over and look for a sticker with model information. You'll see a model number (often starting with letters like "HP-" or "Dell-") and sometimes a barcode. This model number, when searched on the manufacturer's website, takes you directly to the specifications page where screen size is listed.

The sticker may also include other codes like a serial number or service tag. The model number is what you need — it's usually the most prominent text on the sticker. Write it down carefully, including any hyphens or numbers, before you search.

Frequently Asked Questions

Does screen size include the black border around the display?

No. Screen size measures only the visible display area, from corner to corner of the actual screen. The plastic or metal frame around the screen doesn't count toward the measurement.

Why do some laptops have the same screen size but different resolutions?

Manufacturers can fit different numbers of pixels into the same physical space. A 15-inch screen might have 1920 x 1080 pixels or 2560 x 1440 pixels depending on the model. Higher resolution means sharper text and images, but both are 15-inch screens.

If I can't find my laptop model online, what should I do?

Contact the manufacturer's customer support with your model number or serial number. They can tell you the screen size and other specifications even if the product page is no longer online. Most manufacturers keep records of older models.

Is the screen size the same as the laptop size?

No. A 15-inch screen size means the display is 15 inches diagonally, but the overall laptop may be slightly larger because of the frame and bezels around the screen. When people refer to a "15-inch laptop," they're talking about the screen size, not the total dimensions.