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40-inch 16:9 TV vs
42-inch 16:9 TV: dimensions, PPI, and desk fit

Compare exact physical width, height, visible area, pixel density, and desk impact before you choose between these two displays.

Choose 42-inch 16:9 monitor only if your desk depth and viewing distance can handle the height. For all-day desktop work, the smaller or denser option is usually easier to live with. 42-inch 16:9 monitor is the cleaner text-density pick.

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40-inch 16:9 monitor · Option A

Diagonal
40 in / 101.6 cm
Aspect
16:9
Resolution
1920 x 1080 px
Physical W x H
34.9 x 19.6 in
Visible area
684 sq in
Pixel density
55 ppi

42-inch 16:9 monitor · Option B

Diagonal
42 in / 106.7 cm
Aspect
16:9
Resolution
3840 x 2160 px
Physical W x H
36.6 x 20.6 in
Visible area
754 sq in (+10%)
Pixel density
105 ppi
Display 140 in 16:9
Display 242 in 16:9
36.6"20.6"34.9"19.6"
40 in 16:9
42 in 16:9
Width34.9" / 36.6"+1.7"
Height19.6" / 20.6"+1"
Area684 / 754 sq in+10.3%
Pixel Density55 / 105 PPI+90.5%

Specifications

Metric40 in 16:942 in 16:9Diff
Width34.86"36.61"+5%
Height19.61"20.59"+5%
Area683.7 in²753.8 in²+10.3%
Diagonal40"42"+5%
Pixel Density55 ppi105 ppi+90.5%
16:9 content40"42"+5%
4:3 content32.68"34.32"+5%
2.35:1 content37.89"39.78"+5%

The 40-inch 16:9 TV is 34.86" (88.6 cm) wide and 19.61" (49.8 cm) tall, while the 42-inch 16:9 TV is 36.61" (93 cm) wide and 20.59" (52.3 cm) tall. That makes the 42-inch 16:9 TV the larger screen by 10.3% of usable area.

The 40-inch 16:9 TV measures 34.86" (88.6 cm) wide by 19.61" (49.8 cm) tall, with a total screen area of 683.7 square inches. The 42-inch 16:9 TV measures 36.61" (93 cm) wide by 20.59" (52.3 cm) tall, covering 753.8 square inches.

The practical difference: the 42-inch 16:9 TV is 5% wider, the 42-inch 16:9 TV is 5% taller, and 42-inch 16:9 TV offers 10.3% more screen area. Width affects how much desk space you need, while the height delta shows how much vertical space changes for documents, timelines, and video.

The practical choice depends on what feels limiting in your current setup. For desk distance, console use, video, and big-screen work, the wider option gives more room for side-by-side windows, while the taller option keeps more vertical content visible without pushing the edges of the screen as far away. If your desk is shallow, width and viewing distance matter as much as raw diagonal size.

At 1920x1080, the 40-inch 16:9 TV achieves 55 PPI. The 42-inch 16:9 TV at 3840x2160 reaches 105 PPI. The 42-inch 16:9 TV has 90.5% higher pixel density, resulting in sharper text and images.

For text-heavy work, PPI is the number that decides whether you are buying more room or just making everything bigger. A lower-PPI large screen can feel spacious for windows but softer for code and documents. A higher-PPI screen may need OS scaling, but it usually gives cleaner text and more flexible sizing.

Frequently Asked Questions

What are the exact dimensions of a 40-inch 16:9 TV?
A 40-inch 16:9 TV measures 34.86" (88.6 cm) wide by 19.61" (49.8 cm) tall, with a screen area of 683.7 square inches.
What are the exact dimensions of a 42-inch 16:9 TV?
A 42-inch 16:9 TV measures 36.61" (93 cm) wide by 20.59" (52.3 cm) tall, with a screen area of 753.8 square inches.
Which is bigger: 40-inch 16:9 TV or 42-inch 16:9 TV?
The 42-inch 16:9 TV is 10.3% larger in total screen area, though the 40-inch 16:9 TV may be taller depending on aspect ratio.
How much desk space do I need for a 42-inch 16:9 TV?
A 42-inch 16:9 TV requires at least 36.61" of desk width. We recommend 42.61" to allow comfortable margins on each side.
How wide is 40-inch 16:9 TV compared with 42-inch 16:9 TV?
The 40-inch 16:9 TV is 34.86" wide. The 42-inch 16:9 TV is 36.61" wide, so the width change is 1.74" before bezels, arms, or speaker space.
Which has better pixel density: 40-inch 16:9 TV or 42-inch 16:9 TV?
The 42-inch 16:9 TV at 3840x2160 has 105 PPI, which is 90.5% higher than the 40-inch 16:9 TV's 55 PPI.

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