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Screen Resolution Converter

Calculate screen resolution details, PPI, aspect ratio and physical dimensions

Resolution Details

Total Pixels

20,73,600

2.07 MP

Aspect Ratio

16:9

Pixel Density

92 PPI

Video Memory (32-bit)

7.91 MB

Physical Dimensions

Physical Width

20.92 inches

53.13 cm

Physical Height

11.77 inches

29.89 cm

Common Display Resolutions

NameResolutionAspectMegapixels
VGA640×4804:30.31 MP
SVGA800×6004:30.48 MP
XGA1024×7684:30.79 MP
HD (720p)1280×72016:90.92 MP
WXGA1366×76816:91.05 MP
FHD (1080p)1920×108016:92.07 MP
QHD (1440p)2560×144016:93.69 MP
4K UHD3840×216016:98.29 MP
5K5120×288016:914.75 MP
8K UHD7680×432016:933.18 MP
Ultrawide FHD2560×108021:92.76 MP
Ultrawide QHD3440×144021:94.95 MP
iPhone 15 Pro1179×25569:19.53.01 MP
iPad Pro 12.9"2048×27323:45.6 MP

PPI Guidelines

Desktop monitors: 90-110 PPI is standard, 140+ PPI is "Retina" quality

Laptops: 100-130 PPI standard, 200+ PPI for high-DPI displays

Smartphones: 300+ PPI is typical, 400+ PPI for premium displays

Print quality: 300 PPI is standard for professional printing

What is Screen Resolution?

Screen resolution describes the number of distinct pixels that can be displayed on a screen, expressed as width × height (e.g., 1920×1080). A higher resolution means more pixels, resulting in sharper and more detailed images. Resolution is one of the most important specifications for monitors, laptops, phones, and tablets, directly affecting how much content fits on screen and how sharp text and images appear.

Resolution alone does not determine display quality — pixel density (measured in pixels per inch, or PPI) combines resolution with physical screen size to describe actual sharpness. A 27-inch 4K monitor and a 15-inch 4K laptop have the same pixel count, but the laptop's smaller screen makes its pixels much smaller and its image appear sharper. Understanding the relationship between resolution, screen size, and PPI is essential for choosing the right display.

This calculator computes total pixel count, aspect ratio, pixel density (PPI), physical dimensions, and video memory requirements for any resolution and screen size. It includes a database of common display standards from VGA to 8K, making it easy to compare specifications across different devices and find the right resolution for your needs.

Resolution Formulas

Several key properties can be calculated from resolution and screen size using straightforward geometric formulas.

Display Calculations

PPI = √(W² + H²) / D, Total Pixels = W × H, Aspect = W/GCD : H/GCD

Where:

  • W= Width in pixels
  • H= Height in pixels
  • D= Screen diagonal in inches
  • GCD= Greatest common divisor of W and H

Common Display Resolutions

Display technology has evolved through several standard resolutions:

Name Resolution Megapixels Typical Use
HD (720p)1280×7200.92 MPBudget TVs, streaming
FHD (1080p)1920×10802.07 MPMost monitors, TVs
QHD (1440p)2560×14403.69 MPGaming monitors
4K UHD3840×21608.29 MPModern TVs, pro monitors
8K UHD7680×432033.18 MPHigh-end TVs

How to Use This Calculator

Analyze any display resolution:

  1. Enter Width and Height: Type the pixel dimensions of the display.
  2. Enter Screen Diagonal: Input the physical screen size in inches.
  3. View Resolution Details: See total pixels, megapixels, aspect ratio, PPI, and video memory.
  4. Check Physical Dimensions: View the actual width and height of the display in inches and centimeters.
  5. Compare Common Resolutions: Click any preset button (HD, FHD, 4K, etc.) to load that resolution.

The PPI guidelines section helps you understand what pixel density means for your use case — from desktop monitors (90–110 PPI) to smartphones (300+ PPI).

Real-World Applications

Monitor and TV purchasing requires understanding resolution in context. A 27-inch 1080p monitor (82 PPI) looks noticeably pixelated for close-up work, while the same resolution on a 50-inch TV (44 PPI) looks sharp from viewing distance. Matching resolution to screen size and viewing distance ensures the best visual experience within your budget.

Web and graphic design depends on PPI for print quality. Designing at 300 PPI ensures print-ready output, while 72 PPI is standard for web graphics. Understanding resolution helps designers create assets that look sharp across different devices, from Retina smartphones (400+ PPI) to standard desktop monitors (100 PPI).

Video production and streaming is organized around resolution standards. YouTube and Netflix support 720p, 1080p, 4K, and 8K content. Understanding the pixel counts and bandwidth requirements of each resolution helps content creators choose the right output format and viewers understand why higher resolution requires faster internet connections.

Worked Examples

Calculating PPI for a 27-inch 4K Monitor

Problem:

What is the pixel density of a 27-inch monitor with 3840×2160 resolution?

Solution Steps:

  1. 1Diagonal pixels: √(3840² + 2160²) = √(14,745,600 + 4,665,600) = √19,411,200 ≈ 4,405.8
  2. 2PPI = 4,405.8 / 27 ≈ 163.2 PPI
  3. 3Physical width: 3840 / 163.2 ≈ 23.5 inches
  4. 4Physical height: 2160 / 163.2 ≈ 13.2 inches

Result:

163 PPI — a high-quality display suitable for detailed work

Comparing 1080p vs 4K on a 32-inch Display

Problem:

How much sharper is 4K compared to 1080p on a 32-inch screen?

Solution Steps:

  1. 11080p on 32": PPI = √(1920² + 1080²) / 32 ≈ 68.8 PPI
  2. 24K on 32": PPI = √(3840² + 2160²) / 32 ≈ 137.7 PPI
  3. 34K has exactly 4× the pixels and 2× the PPI
  4. 4Physical dimensions are the same; only sharpness changes

Result:

4K is 2× sharper (by PPI) than 1080p on a 32-inch display

Video Memory for 4K Display

Problem:

How much video memory is needed to store one frame of 4K at 32-bit color?

Solution Steps:

  1. 1Total pixels: 3840 × 2160 = 8,294,400 pixels
  2. 2Bytes per pixel at 32-bit: 4 bytes
  3. 3Total memory: 8,294,400 × 4 = 33,177,600 bytes
  4. 4Convert to MB: 33,177,600 / 1,048,576 ≈ 31.6 MB per frame

Result:

~31.6 MB of video memory per 4K frame at 32-bit color

Tips & Best Practices

  • ✓Match resolution to screen size: 1080p is fine for 24", 4K shines at 27" and above
  • ✓PPI matters more than raw resolution for perceived sharpness
  • ✓Higher resolution requires more GPU power for gaming and video rendering
  • ✓4K content needs at least 25 Mbps for smooth streaming
  • ✓A 16:9 aspect ratio is standard for TVs and most monitors; 21:9 is ultrawide
  • ✓For print design, work at 300 PPI; for web, 72–150 PPI is sufficient

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Frequently Asked Questions

1080p (progressive scan) draws all 1080 lines of each frame sequentially, producing a smoother image with less flicker. 1080i (interlaced) draws odd and even lines alternately, which can cause visible flicker on fast-moving content. 1080p is considered superior and is the standard for modern displays, while 1080i was used in early HD broadcasts.
Apple coined 'Retina display' for screens where individual pixels are invisible at normal viewing distance. The threshold varies: for phones held 12 inches away, ~300 PPI is sufficient; for laptops at 18 inches, ~200 PPI; for desktop monitors at 24 inches, ~150 PPI. At these densities, the human eye cannot distinguish individual pixels.
Not necessarily. Resolution interacts with screen size, viewing distance, and content quality. A 4K image stretched to 70 inches may look worse than a 1080p image on a 24-inch monitor. Content must also be rendered at the native resolution — displaying 720p content on a 4K screen requires upscaling, which can actually reduce quality.
The '4K' name comes from the horizontal pixel count being approximately 4,000 (3840). The cinema standard DCI 4K is exactly 4096×2160. The consumer UHD standard rounds down to 3840×2160 to maintain the 16:9 aspect ratio. The naming convention focuses on the horizontal resolution as the primary descriptor.
On Windows, right-click the desktop and select Display Settings to see your resolution. On Mac, go to System Settings > Displays. On phones, check the display specifications in Settings > About Phone. You can also use online tools that detect your screen resolution automatically through the browser.

Sources & References

Last updated: 2026-06-06

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Editorial Note

MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

Source

Formula Source: NIST Guide to SI Units

by National Institute of Standards

UpdatedLast reviewed: May 2026
CheckedFormula checks are based on standard references and internal QA review.