Screen Size Comparison: Compare Screen Sizes Side by Side
Screen Size Comparison. Enter the diagonal and aspect ratio for up to four screens in this screen size comparison to see them drawn side by side. The resolution checker works on any device — desktop, laptop, tablet, or phone — and reports results instantly.
Interactive Tool
Compare Up to Four Screens
Screen 1 dimensions: --
Screen 2 dimensions: --
Screen 3 dimensions: --
Screen 4 dimensions: --
Visual Comparison (To Scale)
Area Comparison
Screen Details
Curious how a 27-inch monitor stacks up against a 55-inch TV? Enter the diagonal size and aspect ratio for up to four screens, and this screen size comparison gives you a to-scale visual comparison showing their real size difference, plus width and height dimensions and an area comparison.
Two screens sold under one number in inches can look nothing alike on your wall or desk. This screen size comparison lets you compare screen sizes side by side, whether that is a television, a monitor or a phone, and shows the real width, height and area gap before you buy. That gap, not the diagonal, decides fit, sharpness and immersion.
How to Use the Screen Size Comparison Tool
Both screens are drawn at true scale, so you see the difference instead of just reading it. Use the refresh rate tester to verify your monitor is delivering its rated refresh rate under the current driver settings.
- Pick an aspect ratio for each display, or type a custom one.
- Enter each diagonal in inches, or switch to centimeters.
- Set the orientation to landscape, or portrait for phones.
- Read the results, then change one size and run it again.
Screen Comparison Presets and the Unit Toggle
Presets load common pairs in one click, such as a 55-inch to a 65-inch TV, which makes this the quickest visual TV size comparison. The unit toggle flips every result between imperial and metric without retyping.
Reading the Results: Width, Height and Screen Area
Each run returns width, height and screen area for both panels, plus the size difference as a percentage. Area is the figure to trust when you compare two screen sizes, because it grows with the square of the diagonal. A 58-inch 16:9 TV is only 20.8% larger than a 48-inch one on the diagonal, yet it has 46.0% more picture: 1,437 sq in against 984 sq in.
Diagonal Screen Size vs Real Width and Height
Width decides whether a set fits a cabinet or your desk space, and height decides how tall text and faces look. Two panels with the same diagonal can differ by several inches each way once the aspect ratio changes.
The Diagonal Measurement Formula
The geometry is a right triangle with the diagonal as its hypotenuse, so the Pythagorean theorem ties it to the two sides. For a ratio a:b and diagonal d:
$$W = d \times \frac{a}{\sqrt{a^{2}+b^{2}}} \qquad H = d \times \frac{b}{\sqrt{a^{2}+b^{2}}}$$For the 48-inch set, \(\sqrt{16^{2}+9^{2}} = 18.36\), so it is 48 × 16 ÷ 18.36 = 41.8 in wide and 48 × 9 ÷ 18.36 = 23.5 in tall. The 58-inch works out to 50.6 × 28.4 in. Trigonometry only comes in once you add a seat.
Aspect Ratio and Surface Area at the Same Diagonal Size
Hold the diagonal fixed and stretch the shape, and the panel gains a little width but loses far more height. A square panel holds the most area for its diagonal, so surface area shows what a wider screen really costs you. The viewing distance calculator calculates the optimal seating distance for any screen size and resolution using THX and SMPTE standards.
Widescreen 16:9 vs 21:9 and 32:9 Panels
One 40-inch diagonal at four common shapes:
| Aspect ratio | Width | Height | Area | Area vs 16:9 |
|---|---|---|---|---|
| 4:3 | 32.0 in | 24.0 in | 768 sq in | +12.3% |
| 16:9 widescreen | 34.9 in | 19.6 in | 684 sq in | baseline |
| 21:9 ultrawide | 36.8 in | 15.8 in | 579 sq in | −15.3% |
| 32:9 super wide | 38.5 in | 10.8 in | 417 sq in | −39.0% |
The widest shape adds only 3.6 in of width over the standard one but gives up 8.8 in of vertical height, so it feels short for documents. The 4:3 shape is the tallest.
Viewing Distance and Field of View for TV Sizes
The field of view a screen fills depends on its width and your viewing distance together, \(\theta = 2\arctan(W \div 2D)\), so comparing TV sizes without measuring the room tells you half the story. From a sofa 8 ft away, the 48-inch set fills 24.6° of your vision and the 58-inch fills 29.5°, which adds immersion only if the seating stays put.
Viewing Angle Standards From THX, SMPTE and CEDIA
Industry bodies specify an angle, not a size. SMPTE treats about 30° as the minimum for a good cinema seat, THX recommends roughly 40° for 16:9 content, and CEDIA home guidance sits near 43° for wide films. Turning the formula around, \(D = W \div 2\tan(\theta \div 2)\), the 58-inch set reaches 30° at 7.9 ft and 40° at 5.8 ft. Most living room layouts land between those marks.
Scope Films, Black Bars and Projector Screens
A 2.35:1 film letterboxed on a 16:9 TV keeps the full width, so its horizontal angle is unchanged; the black bars only cost height. Set your TV beside a home theater scope screen of the same diagonal and the tool shows the trade: wider and shorter, so movies fill more of your view. The angle maths is identical whether a projector or a TV makes the picture.
Checking a Bedroom TV Size Against a 52.75-Inch Wall Niche
I am replacing a bedroom TV that sits in a recess between a window frame and a closet door, and the question is simple: is a 65-inch possible, or is 55 the ceiling? The answer, before any maths about angles, is that the niche decides: the 65-inch is 3.9 in too wide, so it is out.
What I have to work with is a tape measure. The niche is 52.75 in wide, and with my head on the pillows my eyes sit 101.5 in from the wall. I enter two 16:9 displays, 55 and 65, because those are the two sizes on sale.
The tool runs the same right-triangle split shown above: 55 × 16 ÷ 18.36 gives a 47.94 in wide panel, and 65 gives 56.65 in. Against 52.75 in, that leaves 4.81 in spare for the 55 and a 3.9 in overlap for the 65. I cross-check one detail by hand: many "65-inch class" sets measure 64.5 in on the diagonal, but that is still 56.22 in wide, 3.47 in too wide. The class label never rescues a fit this tight.
Next I check the angle. At 101.5 in, the 55-inch fills 26.6° of my view, short of the 30° SMPTE minimum. Solving backwards, reaching 30° from the bed needs a 62.4-inch diagonal, which cannot fit. So I rerun with the largest panel that leaves 1 in each side: 58.2 in on the diagonal.
| Option | Panel width | Spare in niche | Angle from bed |
|---|---|---|---|
| 55-inch at 101.5 in | 47.94 in | 4.81 in | 26.6° |
| 60-inch at 101.5 in | 52.29 in | 0.46 in | 28.9° |
| 55-inch at 89 in | 47.94 in | 4.81 in | 30.1° |
The 60-inch looks tempting, but 0.46 in is panel glass only; its frame and bezel would almost certainly touch the window trim, so I treat any option under about 1 in of spare width as a no. Moving the bed 12.5 in closer, to 89 in, gets the 55-inch to 30.1° instead.
My judgement: in a recess, the number to watch is width, not diagonal. I'm buying the 55-inch and sliding the bed forward, which gives the bigger-feeling picture without forcing a set that physically cannot go in.
Pixel Density, PPI and 4K: The Size Difference Inches Hide
Pixel density is the diagonal pixel count divided by the diagonal:
$$\text{PPI} = \frac{\sqrt{x^{2}+y^{2}}}{d}$$A 4K (3840 × 2160) panel at 58 in works out to 76.0 PPI, plenty from a sofa, while the same resolution on a 43-inch screen reaches 102.5. Whether you see pixels depends on distance too, which is all a retina claim describes.
OS Scaling and the Desktop Sweet Spot
At a desk you sit about 2 ft away, so density matters more for sharpness. A 27-inch full HD (1080p) monitor gives just 81.6 pixels per inch and looks soft, while a 24-inch QHD panel packs 122.4 and usually needs 125% OS scaling. The sweet spot for unscaled text sits between them, which is why 1440p is so common at 27 in, and why a 32-inch at that resolution slides back to the soft end.
Dual Monitors vs Ultrawide and Super Ultrawide Monitor Sizes
For a multi-window workspace, you are choosing between two panels with a seam and one continuous sheet of pixels. Gaming and video timelines favour the unbroken ultrawide, while productivity setups with one app per screen often prefer two panels.
Two Monitors vs a 38-Inch Ultrawide
- Two 24-inch 16:9 panels: 41.8 in wide, 11.8 in tall, 492 sq in, with a bezel gap.
- One 38-inch ultrawide: 34.9 in wide, 15.0 in tall, 523 sq in, no seam.
The pair gives more horizontal space; the single panel is taller with more total area. A 34-inch ultrawide is the usual middle step, and one run puts it beside a 27-inch.
Desk Depth, VESA Mounts and Eye Level
Use the compared height to set the stand: keep the top edge at or just below eye level, a basic rule of ergonomics. Use the compared width to plan desk depth, since a 34-inch or larger panel is easier on your eyes from a little beyond arm's length. If the stand's footprint is the problem, a VESA arm frees it.
Phone, Tablet and Laptop Screens in a Device Comparison
Small screens follow the same maths. Enter both diagonals and a phone, a tablet such as an iPad, or a notebook lines up against anything else on one scale.
Screen Resolution, Viewport and Device Pixel Ratio
Two phones with the same diagonal can show different content, since the physical size the tool reports is one layer:
- Screen resolution: the physical pixels the panel has.
- Viewport: the CSS pixels a page can lay out in.
- Device pixel ratio: physical pixels per CSS pixel, so a 3× phone maps each layout pixel to a 3 × 3 block.
Frequently Asked Questions
- How is screen size measured?
- Screen size is the diagonal of the visible picture, from one corner to the opposite corner, in inches or centimetres. It does not tell you width or height on its own; those depend on the aspect ratio.
- How do you get width and height from the diagonal?
- Use the Pythagorean theorem. For a ratio a:b and diagonal d, width = d × a ÷ √(a² + b²) and height = d × b ÷ √(a² + b²). A 48-inch 16:9 screen is about 41.8 in wide and 23.5 in tall.
- Why does a wider screen have less area at the same diagonal?
- For a fixed diagonal, a square panel holds the most area. As the shape gets wider, it gains a little width but loses more height, so a 21:9 or 32:9 screen has noticeably less area than a 16:9 screen with the same diagonal.
- Why is the area difference bigger than the diagonal difference?
- Area grows with the square of the diagonal. Going from 48 to 58 inches is about 21% more diagonal but about 46% more picture.
- How far should I sit from a screen?
- Industry guidance is set by viewing angle. THX suggests about 40° for an immersive picture and SMPTE treats about 30° as a minimum, so the tool gives you the distance at which each screen fills those angles.
- What does pixel density (PPI) tell me?
- PPI is the diagonal pixel count divided by the diagonal in inches. Two screens with the same resolution look sharper on the smaller one, and how much it matters depends on how far away you sit.
- Does aspect ratio change how big a film looks on my TV?
- A 2.35:1 film letterboxed on a 16:9 TV keeps the full width and loses height to black bars. A dedicated 2.35:1 screen of the same diagonal is wider, so it gives a wider picture from the same seat.