Calculate physical
screen dimensions instantly.
Enter resolution and diagonal to get inches, centimeters, PPI, and megapixels.
Screen Size Calculator
Calculate physical screen size, PPI, and aspect ratio from pixel dimensions.
What is a Screen Size Calculator?
A screen size calculator determines physical screen dimensions from pixel resolution and diagonal measurement. It calculates PPI (Pixels Per Inch) using PPI = √(W² + H²) ÷ diagonal. Width and height in inches are derived by dividing pixels by PPI. Common examples: a 24" monitor at 1920×1080 ≈ 92 PPI, a 27" monitor at 2560×1440 ≈ 109 PPI. Remember: resolution (pixel count) differs from physical screen size (diagonal inches).
About Screen Size Calculator
This screen size calculator turns pixel resolution and diagonal measurement into physical screen dimensions in inches and centimeters. It is useful for anyone buying a monitor, planning a design layout, or checking whether a display meets a physical space requirement.
By entering width, height, and diagonal, you instantly get physical width and height, PPI, aspect ratio, and megapixel counts. It works for monitors, laptops, tablets, phones, and TVs.
What is Screen Size?
Screen size usually refers to the diagonal distance between two opposite corners of the display area. A 27-inch monitor means the diagonal measures 27 inches from corner to corner.
Physical width and height are smaller than the diagonal. A 24-inch 16:9 monitor is roughly 20.5 inches wide and 11.5 inches tall. Our display size calculator computes these exact measurements from resolution and diagonal.
How Screen Size is Calculated
First, the tool calculates PPI using the formula: PPI = √(width² + height²) ÷ diagonal inches. Then physical width = width ÷ PPI, and physical height = height ÷ PPI. The same values can be converted to centimeters by multiplying inches by 2.54.
This screen inches calculator performs the full chain automatically. No manual math, no separate PPI lookup, and no approximations.
Screen Size vs Resolution
Screen size is the physical measurement of the display. Resolution is the number of pixels arranged horizontally and vertically. A 24-inch 1080p monitor and a 27-inch 1080p monitor share the same resolution, but the larger screen has lower pixel density and softer images.
Our monitor size calculator helps you compare displays by showing both physical size and pixel density side by side.
Common Monitor Sizes
Popular monitor diagonals include 21.5", 24", 27", 32", and 34" for desktops, 13"–17" for laptops, and 6"–7" for phones. Within each size, monitor dimensions vary by aspect ratio.
- 24" 16:9: about 20.9" × 11.7"
- 27" 16:9: about 23.5" × 13.2"
- 32" 16:9: about 27.9" × 15.7"
- 34" 21:9 ultrawide: about 29.9" × 12.8"
Benefits
This free screen size calculator helps shoppers verify actual monitor dimensions before purchase. Designers use it to match mockups to real devices. Developers use it when planning responsive breakpoints and viewport sizes.
Because the tool reports inches, centimeters, PPI, and aspect ratio in one place, you rarely need to cross-reference multiple calculators. Results update live, so you can compare multiple configurations quickly.
Frequently Asked Questions
Enter resolution and diagonal inches into our screen size calculator. It returns physical width and height in inches and centimeters automatically.
Generally yes, but monitor dimensions also depend on aspect ratio. Two 27-inch monitors with different aspect ratios can have different usable widths and heights.
Screen size is physical width/height. Resolution is the pixel count. A large screen with low resolution can look softer than a smaller high-resolution screen. Use our display size calculator to see both.
Yes. Our screen inches calculator works with any display that has a known resolution and diagonal measurement, including TVs, projectors, and VR headsets.
Yes. It functions as a monitor size calculator by returning physical monitor dimensions for any given resolution and diagonal.
Higher PPI means more pixels per inch, producing sharper text and images. This screen size calculator shows PPI alongside physical dimensions so you can judge both size and clarity.
Yes. A 32-inch 16:9 monitor is wider and shorter than a 32-inch 16:10 monitor. Our display size calculator accounts for aspect ratio when computing physical measurements.
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