18 Inch Laptop Screen Dimensions
An 18 inch laptop has a screen 15.3 in38.8 cm wide and 9.5 in24.2 cm tall (38.8 cm15.3 in x 24.2 cm9.5 in). The 18 inches is measured diagonally across the glass, corner to corner. The laptop itself is always a little bigger than these numbers.
Below you can see it to scale, with the exact screens of popular 18 inch laptops. You will also find the viewing distance and resolution that suit this size.
- Width
- 15.3 in 38.8 cm
- Height
- 9.5 in 24.2 cm
- Diagonal
- 18 in 45.7 cm
- Aspect ratio
- 16:10
How big is an 18 inch laptop screen?
Here it is drawn to scale against the largest size in our chart, the 18 inch. The screen covers 146 sq in939 sq cm, 14% more than a 17.3 inch laptop.
- Diagonal
- 18 in (45.7 cm)
- Width
- 15.3 in38.8 cm · 38.8 cm15.3 in
- Height
- 9.5 in24.2 cm · 24.2 cm9.5 in
- Screen area
- 146 sq in939 sq cm
- Aspect ratio
- 16:10
- Perimeter
- 49.6 in126.0 cm
Who is an 18 inch laptop for?
Eighteen inches is the biggest size in our chart, used on gaming and workstation laptops such as the Alienware 18 Area-51. These are heavy machines with powerful graphics, built to stay on a desk. Check the body size before you buy a bag, as these laptops are much wider than the screen alone.
Which popular laptops have an 18 inch screen?
Laptops with the same screen size can differ by an inch or more in width and depth. Check the maker's spec sheet before you buy a sleeve. Here are the exact screens of popular 18 inch laptops.
Models sold as 18 inch can measure a little more or less. The width and height come from each model's own resolution.
Our list has five 18 inch models, from HP, Dell, Acer and ASUS. 2560 × 1600 is the most common resolution, on three of them. Three models share the sharpest screen, at 168 PPI.
The Acer Aspire 18 AI (A18-I71M) and ASUS Vivobook 18 (M1807) share the softest, at 126 PPI. At a typical 18 in46 cm, you could make out single pixels on every one of them with 20/20 vision.
How far should you sit from an 18 inch laptop?
A laptop usually sits 14 to 24 in (36 to 61 cm) from your eyes. The table shows how much of your view an 18 inch screen fills at each distance. It feels very wide at 14 to 16 in36 to 41 cm, wide at 18 to 20 in46 to 51 cm and ideal at 22 to 24 in56 to 61 cm.
Which resolution suits an 18 inch laptop?
Higher resolution looks sharper but makes text smaller, so you need display scaling. At 18 inches, 1920 × 1200 gives 126 PPI and 2880 × 1800 gives 189 PPI. The table shows the Windows scaling each needs.
Sit farther away than the last column and you will not see single pixels. See every resolution in the chart.
At this size, 2560 × 1600 hides single pixels from about 20 in51 cm and 2880 × 1800 from about 18 in46 cm. 1920 × 1200 shows them even at 24 in61 cm. At 200% scaling, 2880 × 1800 draws everything twice as big, so its extra pixels go to sharpness, not space.
None of them runs at 100%, as text would be too small to read at 18 in46 cm.
How does an 18 inch laptop compare with other sizes?
This is the largest laptop size in our chart. The next size down, the 17.3 inch laptop, has 12% less screen area. Area grows with the square of the diagonal, so a few inches feel bigger than they sound.
It is the biggest of the nine laptop sizes in our chart. The 17.3 inch laptop, the next size down, uses the 16:9 shape instead of 16:10. It is about a fifth of an inch narrower and about an inch shorter, with about a tenth less screen area.
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Affiliate linksMore questions about 18 inch laptops
What are the dimensions of an 18 inch laptop screen in cm?
The screen is 38.8 x 24.2 cm, with a diagonal of 45.7 cm.
Is an 18 inch laptop 18 inches wide?
No. 18 inches is the screen diagonal, and the screen is 15.3 in wide.
What resolution is best for an 18 inch laptop?
1920 × 1200 gives 126 PPI at this size, which suits 125% Windows scaling. Higher resolutions look sharper but use more battery.
How much of my view does an 18 inch laptop fill?
At 18 inches (46 cm) from your eyes, the screen fills about 46° of your view. Plug in a monitor if you want a bigger picture at a desk.
How we measure
Screen width = diagonal x a / sqrt(a^2 + b^2) and height = diagonal x b / sqrt(a^2 + b^2) for an a:b screen. Viewing angle = 2 x arctan(half the screen width / distance). Pixel visibility uses 1 arcminute, the limit of 20/20 vision.
Model screens come from each maker's published spec sheet, linked in the table. Last checked 2026-10-13.