Monitor Size Calculator
Calculate screen dimensions from diagonal size and aspect ratio
Diagonal → Width × Height
Screen Dimensions
Width × Height → Diagonal
Common Monitor Sizes (16:9)
| Diagonal | Width | Height | Area | Common Use |
|---|---|---|---|---|
| 24" | 20.9" (53.1 cm) | 11.8" (29.9 cm) | 246.6 sq in | Entry-level monitor |
| 27" | 23.5" (59.8 cm) | 13.2" (33.6 cm) | 311.5 sq in | Popular desktop |
| 32" | 27.9" (70.8 cm) | 15.7" (39.9 cm) | 438.0 sq in | Large desktop / 4K |
| 43" | 37.5" (95.2 cm) | 21.1" (53.5 cm) | 790.7 sq in | TV / Large display |
| 55" | 47.9" (121.8 cm) | 27.0" (68.5 cm) | 1293.3 sq in | Living room TV |
| 65" | 56.7" (143.9 cm) | 31.9" (81.0 cm) | 1808.0 sq in | Large living room TV |
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How to Calculate Monitor Physical Dimensions from Diagonal Size
Our monitor size calculator converts diagonal screen measurements into actual width and height dimensions. When shopping for monitors, manufacturers advertise diagonal size (like 27" or 32"), but you need to know the physical width and height to ensure the display fits your desk space and mounting setup.
The calculation uses basic trigonometry based on the monitor's aspect ratio. A 27-inch 16:9 monitor has different dimensions than a 27-inch 21:9 ultrawide, even though both share the same diagonal measurement. Understanding these differences is crucial for desk planning and ergonomic setup.
How Aspect Ratio Affects Monitor Dimensions
16:9 Widescreen Monitors
Standard 16:9 monitors are the most common form factor. A 27-inch 16:9 display measures approximately 23.5 inches wide by 13.2 inches tall. This aspect ratio balances productivity workspace with media consumption, fitting comfortably on most desks.
21:9 Ultrawide Displays
Ultrawide monitors provide significantly more horizontal space. A 34-inch 21:9 ultrawide is approximately 31.4 inches wide but only 13.2 inches tall. This extra width is excellent for productivity and immersive gaming but requires a wider desk.
32:9 Super Ultrawide
Super ultrawide displays at 32:9 aspect ratio are essentially two 16:9 monitors combined. A 49-inch 32:9 monitor spans over 47 inches wide, requiring careful desk space planning and often specialized mounting solutions.
Common Monitor Sizes and Their Physical Dimensions
24-Inch Monitors
A 24-inch 16:9 monitor measures about 20.9" × 11.8". This compact size is popular for office environments and multi-monitor setups where desk space is limited. It's the minimum recommended size for 1080p resolution.
27-Inch Monitors
The 27-inch form factor (23.5" × 13.2") has become the sweet spot for desktop computing. It provides enough screen real estate for 1440p resolution without overwhelming typical desk setups, ideal for both gaming and productivity.
32-Inch and Larger
32-inch monitors (27.9" × 15.7") and larger displays work best for 4K resolution where pixel density remains sharp. These sizes benefit from increased viewing distance and are excellent for media editing, gaming, and content creation.
Planning Desk Space for Your Monitor Setup
When calculating required desk space, account for the monitor stand depth (typically 6-10 inches) and any additional clearance needed behind the display for cable management. Monitor arms can reclaim this space while providing flexible positioning.
For multi-monitor setups, consider the combined width plus any gap between displays. Two 27-inch monitors side by side require approximately 48 inches of horizontal space. Curved monitors may reduce this slightly by angling the edges toward you.
Remember to factor in viewing distance when selecting monitor size. Larger displays require greater distance for comfortable viewing without excessive head movement. Most ergonomic guidelines suggest arm's length (20-28 inches) for standard desktop monitors.