Screen Size Calculator
Calculate exact screen dimensions from diagonal size and aspect ratio
Enter Diagonal Size
Input your screen’s diagonal measurement in inches. This is the standard way monitors and TVs are measured – from one corner to the opposite corner.
Select Aspect Ratio
Choose your display’s aspect ratio. 16:9 is standard for most monitors and TVs. 21:9 is ultrawide, and 32:9 is super ultrawide for immersive gaming.
View Results
See the exact width, height, and total screen area. Use this for desk planning, mounting, or comparing different screen sizes and aspect ratios.
Diagonal Measurement
Screen size is measured diagonally from corner to corner. A 27" 16:9 monitor is actually 23.5″ wide and 13.2″ tall.
Aspect Ratio Impact
Same diagonal, different ratios mean different dimensions. A 34″ ultrawide (21:9) is wider but shorter than a 34″ standard (16:9).
Screen Area
Ultrawide monitors have less total area than standard monitors of the same diagonal. A 34″ 21:9 has similar area to a 27″ 16:9.
Desk Planning
Knowing exact dimensions helps plan your setup. Consider monitor arm reach, desk depth, and viewing distance for ergonomic placement.
Frequently Asked Questions
What screen size is best for a 1080p monitor at desk distance?
At 24 inches, 1080p delivers 92 PPI — comfortable for most users at 60-70 cm. At 27 inches, 1080p falls to 82 PPI, where individual pixels become visible during text reading for many people. For 27-inch panels, 1440p (109 PPI) is the practical minimum; 4K (163 PPI) is ideal. The rule of thumb: each step up in screen size should be matched with a proportional resolution increase to maintain pixel density.
How do I compare two monitors with different diagonal sizes and resolutions?
Calculate PPI for each: PPI = diagonal pixel count / diagonal inches. A 24-inch 1080p monitor has 92 PPI; a 27-inch 1440p has 109 PPI; a 32-inch 4K has 138 PPI. The higher PPI panel renders sharper images and text at the same physical size. For dual-monitor setups, matching PPI between panels ensures consistent text sharpness and avoids jarring visual transitions when moving windows.
Is a 32-inch monitor too large for desk use?
At standard 60-70 cm desk viewing distances, a 32-inch panel subtends a roughly 35-40 degree horizontal field of view — slightly beyond the THX recommendation for cinematic immersion but within comfortable ergonomic limits. The main trade-off is that your eyes must travel farther to scan the full screen, which can increase neck movement. Many users mitigate this with a monitor arm that allows variable positioning.
How much screen area does a 27-inch 16:9 monitor have?
A 27-inch 16:9 panel measures approximately 23.5 inches wide by 13.2 inches tall, yielding a screen area of about 310 square inches (0.2 square meters). A 32-inch 16:9 panel gives roughly 434 square inches — 40% more visible area for a 19% increase in diagonal. Area grows as the square of the diagonal ratio, so larger sizes provide disproportionately more workspace.
Why is monitor diagonal measured at the bezel, not the active display area?
Industry practice follows a historical convention from CRT displays, where the tube glass extended to the bezel edge. On modern flat panels, the rated diagonal applies to the active pixel area only — no bezel is included. However, panel-to-panel measurement methodology can vary slightly, and spec sheets sometimes round. Physical measurement of the active area diagonally is the definitive check when precision matters.