7 Screen Size Myths Most People Still Believe (2026) | Easy Compare

When it comes to screens, misinformation is everywhere. From sales pitches to well-meaning advice, people repeat myths about screen size that can lead to bad buying decisions. We have debunked the seven most common screen size myths using actual measurements, physics, and real-world testing. How many did you believe?

Myth 1: A 6.9-inch Phone Screen Is Much Bigger Than 6.7 Inches

This is one of the most pervasive phone myths. A 6.9-inch diagonal sounds like a meaningful upgrade from 6.7 inches, but the actual screen area difference is surprisingly small. A typical 6.7-inch phone screen (20:9 ratio) has an area of about 18.7 square inches, while a 6.9-inch screen at the same ratio is about 19.8 square inches — a difference of less than 6 percent.

In daily use, you will not notice that difference unless you hold both phones side by side. The upgrade is even less noticeable when the phone body is wider or taller. Compare for yourself using our screen comparison tool or read our detailed 6.7 vs 6.9 inch analysis.

Myth 2: Diagonal Size Tells the Whole Story

Screen sizes are measured diagonally, but two screens with the same diagonal can have very different areas. A 55-inch TV with a 16:9 aspect ratio has about 1,274 square inches of viewable area. But a 55-inch ultrawide monitor at 21:9 has only about 1,091 square inches — that is 14 percent less screen area despite the same diagonal measurement.

This happens because aspect ratio changes the shape of the rectangle. A wider, shorter screen has less total area than a squarer one at the same diagonal. When comparing screens, always look at width, height, and total area — not just the diagonal number. We break this down in our guide on screen area vs diagonal.

Myth 3: Bigger Screens Are Always Better for Your Eyes

A common belief is that a larger screen reduces eye strain because everything is bigger. In reality, eye strain is driven by viewing distance, resolution, and break frequency — not screen size alone. A 32-inch 1080p monitor at desk distance has terrible pixel density (about 69 PPI), making text look fuzzy and forcing your eyes to work harder. A 24-inch 4K monitor at 183 PPI renders crisp text that is much easier on your eyes.

The key is matching screen size to resolution and distance. For more on this topic, see our detailed guide on screen size and eye strain.

Myth 4: Two 24-inch Monitors Equal One 48-inch Screen

If you put two 24-inch monitors side by side, you do not get the same experience as one 48-inch display. Two 24-inch 16:9 monitors have a combined resolution of 3840x2160 — the same as one 48-inch 4K TV. But the bezels between them break the continuity, and the usable area is interrupted by a gap.

More importantly, the total screen area of two 24-inch monitors is about 547 square inches, while a single 48-inch TV is about 970 square inches. The single large screen provides nearly 77 percent more area. Each setup has its advantages — dual monitors for productivity multitasking, single large screen for immersion. Read our comparison in the ultrawide vs dual monitor guide.

Myth 5: A 65-inch TV Is Only Slightly Bigger Than a 55-inch

A 10-inch difference in diagonal sounds modest, but the actual screen area tells a very different story. A 55-inch TV has about 1,274 square inches of screen area, while a 65-inch TV has about 1,784 square inches. That is a 40 percent increase in total screen area. Going from 65 to 75 inches is another 34 percent jump. These area differences are why upgrading from a 55 to a 65 inch TV feels so dramatic in person.

Compare TV sizes visually before you buy to understand the real difference. Check our 55 vs 65 inch visual comparison to see them side by side.

Myth 6: Monitor Size Determines Productivity

Many people assume that a larger monitor automatically makes them more productive. Research from the University of Utah found that productivity gains plateau around 24 to 27 inches for single-monitor setups. Beyond that, the gains diminish unless you work with large spreadsheets, timelines, or creative tools that benefit from extra space.

What matters more for productivity is how you use the space. A well-organized 27-inch monitor with proper window snapping can be just as productive as a disorganized 34-inch ultrawide. Resolution also plays a role — sharper text reduces reading effort. See our best monitor size for programming guide for task-specific recommendations.

Myth 7: All 15-inch Laptops Have the Same Screen Size

Not all 15-inch laptop screens are created equal. Most "15-inch" laptops actually have 15.6-inch panels, but the physical dimensions vary because of bezels, aspect ratios, and display technology. A modern 15.6-inch laptop with thin bezels may have a smaller overall footprint than an older 14-inch laptop with thick bezels.

Aspect ratio also differs. Some laptops use 16:9 (widescreen), while others use 16:10 (taller), which gives you more vertical space for coding or document editing at the same diagonal. A 15.6-inch 16:10 screen has about 7 percent more area than a 15.6-inch 16:9 screen. Read our 15 vs 16 inch laptop guide for more on these differences.

Stop Guessing — Compare Screens Accurately

The biggest myth of all is that you can judge screen sizes by their diagonal numbers alone. Real-world screen area depends on aspect ratio, bezels, and physical dimensions. Before buying any display, use our free screen comparison tool to see exact dimensions, areas, and visual overlays. It takes the guesswork out of every screen size decision — from phones to TVs. For a deeper dive, check our complete screen size comparison guide.