Screen Size Calculator
Calculate display dimensions without the guesswork
A good screen size calculator helps you move beyond the number printed on a product page. Diagonal size alone doesn't tell the whole story, especially when two screens use different aspect ratios or resolutions. With the right inputs, you can quickly work out the physical width and height of a display, estimate the diagonal from measured dimensions, and see how sharp a panel is through pixel density.
Useful for monitors, TVs, laptops, and mobile devices
This tool is handy if you're comparing a new monitor, checking whether a laptop fits your bag, or evaluating a phone display. Enter the values you know, such as diagonal and aspect ratio or width and height, and the calculator fills in the missing details. If you also provide resolution, the tool can compute total pixels and pixels per inch for a clearer picture of display sharpness.
Fast results with clear units
Because display specs are often listed in different formats, this screen size calculator keeps things practical. Results are shown clearly, and you can switch between inches and centimeters to match your needs. It's a simple way to understand screen dimensions, compare displays fairly, and make better buying or setup decisions.
FAQs
How do you calculate screen width and height from diagonal size and aspect ratio?
The calculator treats the screen like a right triangle. The aspect ratio gives the proportional relationship between width and height, and the diagonal is the hypotenuse. From there, it scales those proportions to the actual diagonal length so you get the physical width and height. This is the standard way display dimensions are derived for monitors, TVs, tablets, and phones.
What is PPI, and when does it matter?
PPI means pixels per inch, which tells you how tightly packed the pixels are on a screen. A higher PPI usually means sharper text, smoother lines, and a more detailed image, especially when you're viewing the display up close. It matters most for phones, tablets, laptops, and design work, but it's also useful when comparing monitors with similar resolutions and different physical sizes.
Can I use centimeters instead of inches?
Yes. The tool can display results in either inches or centimeters, which is helpful if you're working with product specs from different regions. Screen size and PPI calculations are commonly based on inches, but converting the final dimensions to centimeters makes the results easier to use for desk planning, enclosure sizing, or general comparison.
