Screen Size Calculator

Calculate screen dimensions, resolution, and pixel density with our free online calculator. Perfect for determining display specifications and comparing different screen sizes.

Features

• Calculate screen measurements from:
  • Diagonal size
  • Width and height
• Common resolution presets
• Automatic calculations for:
  • Physical dimensions
  • Pixel density (PPI)
  • Aspect ratio
  • Screen area
• Real-time updates
• Mobile-friendly interface

How to Use

1. Choose input method:
   • Diagonal size
   • Width and height
2. Enter screen measurements in inches
3. Select screen resolution
4. Get instant calculations for all measurements

Understanding Screen Measurements

Screen sizes can be confusing—diagonal measurements, resolutions, pixel density, aspect ratios. When you're shopping for a monitor, TV, or phone, you're bombarded with numbers, and it's not always clear what they mean or how they relate to each other.

The diagonal size is what everyone talks about—that 27-inch monitor or 55-inch TV. It's measured corner to corner across the screen. But diagonal doesn't tell you everything. A 27-inch monitor could be wide and short or square and tall depending on the aspect ratio. The diagonal is useful for comparison, but it doesn't give you the actual dimensions or area.

Physical dimensions matter when you're trying to fit a screen somewhere. The width and height tell you how much space it actually takes up. A 27-inch monitor might be 24 inches wide and 13.5 inches tall (if it's 16:9 aspect ratio). That matters when you're measuring your desk or wall space. The area tells you the total screen real estate—how much viewing space you actually get.

Resolution is the number of pixels. 1920×1080 means 1920 pixels wide by 1080 pixels tall. More pixels generally means sharper images, but resolution alone doesn't tell you how sharp—you need pixel density for that. A 27-inch monitor at 1920×1080 has the same resolution as a 24-inch monitor at 1920×1080, but the 24-inch will look sharper because the pixels are packed tighter.

PPI (Pixels Per Inch) is pixel density—how many pixels fit in one inch of screen. Higher PPI means sharper images. A 27-inch 4K monitor (3840×2160) has about 163 PPI. A 27-inch 1080p monitor has about 82 PPI—half the density, so it looks less sharp, especially up close. Phone screens have high PPI (300+ is common) because you hold them close. TVs have lower PPI because you sit farther away.

Aspect ratio is the proportional relationship between width and height. 16:9 is the most common—for every 16 units of width, you get 9 units of height. It's the standard for TVs and most monitors. 21:9 is ultrawide—much wider than tall, great for multitasking. 4:3 is the old square format. The aspect ratio affects how content looks and how much horizontal or vertical space you have.

Shopping for displays involves comparing all these numbers. A 24-inch 1080p monitor versus a 27-inch 1440p monitor—which is better? The 27-inch is bigger but might not fit your desk. The 1440p has more pixels but costs more. Understanding the relationships between size, resolution, and pixel density helps you make informed decisions.

Monitor selection for work or gaming depends on what you need. For coding or spreadsheets, you want more screen real estate—maybe a larger monitor or multiple monitors. For gaming, refresh rate and resolution matter more than size. Pixel density affects text clarity—higher PPI makes text easier to read, which matters for long work sessions.

TV shopping is similar but different. You sit farther from a TV, so pixel density matters less. A 55-inch 4K TV has lower PPI than a 27-inch 4K monitor, but it looks fine because you're sitting 8-10 feet away instead of 2 feet. Size matters more for TVs—you want something that fills your viewing space appropriately. Too small and you strain to see. Too large and it's overwhelming.

Phone and tablet screens are different. High PPI is important because you hold them close. A phone with 400+ PPI looks very sharp. Screen size affects portability—bigger screens are better for viewing but harder to carry. Understanding the trade-offs helps when choosing devices.

Design work requires understanding screen specs. If you're designing websites or apps, you need to know what resolutions people use. Creating graphics for displays requires knowing the target screen size and resolution. Planning presentations means understanding projector or display resolutions. Working with screen measurements helps you create content that looks good.

Space planning involves physical dimensions. Will that 32-inch monitor fit on your desk? Does the TV fit between those windows? Calculating actual width and height helps you plan setups before buying. The diagonal measurement alone doesn't tell you if something will fit in your space.

Comparing displays becomes easier when you understand all the numbers. Two monitors might both be "27-inch" but have different resolutions, different aspect ratios, different pixel densities. Understanding how these relate helps you see which one actually suits your needs better.

This calculator makes it all simple. Enter the diagonal size or dimensions, pick the resolution, and it calculates everything—width, height, area, pixel density, aspect ratio. No need to do the math yourself or look up conversion formulas. Whether you're shopping for displays, planning a setup, or just curious about screen specs, this tool gives you all the numbers you need.

Common Screen Resolutions

• HD (1280×720)
• Full HD (1920×1080)
• 2K (2560×1440)
• 4K (3840×2160)
• 5K (5120×2880)
• 8K (7680×4320)

Applications

Display Shopping

• Compare screen sizes
• Check pixel density
• Verify physical dimensions
• Understand specifications

Design

• Plan layouts
• Calculate image sizes
• Determine viewing distances
• Optimize content

Technical Planning

• Monitor selection
• TV placement
• Projector setup
• Space planning

Why Use Our Calculator

• Instant calculations
• Common resolution presets
• Clear, detailed results
• User-friendly interface
• Works offline
• Free to use