Screen Size Calculator

- May 11, 2025
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Calculate screen dimensions, diagonal size, aspect ratio, and pixel density for monitors, TVs, phones, and other displays.

Screen Size Calculator

Display Options

About Screen Sizes and Calculations

Screen sizes are commonly described by their diagonal measurement, but calculating the actual dimensions requires knowing the aspect ratio. This calculator helps you determine all dimensions based on various inputs.

Common Aspect Ratios
  • 16:9 (1.78:1) - Standard widescreen format used in most modern TVs, monitors, and smartphones
  • 16:10 (1.6:1) - Slightly taller widescreen format, popular in some laptop displays
  • 21:9 (2.33:1) - UltraWide format used in cinematic displays and productivity monitors
  • 4:3 (1.33:1) - Traditional format used in older TVs and displays
Mathematical Relationships

These are the key formulas used in screen size calculations:

  • Diagonal² = Width² + Height²
  • Aspect Ratio = Width ÷ Height
  • Pixel Density (PPI) = Diagonal Pixels ÷ Diagonal Inches
  • Screen Area = Width × Height

Understanding the Screen Size Calculator

The Screen Size Calculator is a handy tool designed to help you find the dimensions of displays like monitors, TVs, and smartphones. It can calculate various measurements, including diagonal size, aspect ratio, and pixel density. Whether you're buying a new device or just curious about your current one, this calculator is easy to use and provides quick results.

How to Calculate Screen Size from Diagonal

One of the main features of the calculator is its ability to calculate screen size based on diagonal measurements. Users can enter the diagonal size in inches or centimetres. You can also select from common aspect ratios like 16:9 or 4:3. This method is especially useful for those looking to match their current screen or find a new one that fits their preference.

Calculating from Width and Height

If you know the width and height of your screen, you can use that information to find the diagonal size. This tab allows you to input the width and height in inches or centimetres. The calculator will then provide the diagonal size along with Other relevant information. This is perfect for those who already have a specific setup in mind and want to know more about it.

Using Resolution to Determine Size

The calculator also offers an option to calculate screen size based on resolution. You can choose from several common resolutions like 1920x1080 or 3840x2160. Once you input the resolution, the calculator will give you the diagonal size, width, and height. This is particularly helpful for gamers or professionals who need precise measurements for high-definition displays.

Exploring Aspect Ratios

  • 16:9: Common widescreen format found on most modern TVs and monitors.
  • 16:10: A slightly taller format popular among laptops.
  • 21:9: Used for ultra-wide displays, great for movies and gaming.
  • 4:3: Standard for older TVs and monitors.

Understanding aspect ratios is key to using the calculator effectively. They determine how the width and height of a screen relate to each other, which can affect your viewing experience.

Benefits of Knowing Your Screen's Pixel Density

Pixel density, measured in pixels per inch (PPI), indicates how sharp an image appears on your display. Higher PPI means a clearer image. The Screen Size Calculator can compute pixel density based on diagonal size and resolution, helping you understand the visual quality of your screen better.

Visual Representation of Results

One of the standout features of the calculator is its ability to create a visual representation of your screen size. This helps you see how your inputted dimensions compare to common screen sizes. You can easily grasp how your display measures up against others, making it a valuable tool for visualisation.

Additional Options and Customisation

The calculator offers advanced options such as adjusting the number of decimal places in the results. You can also choose whether to show the visual representation. This customisation ensures you get the most relevant information tailored to your needs, making your calculations more user-friendly.