Screen Size Calculator – Measure Your Display Dimensions

Imagine Alex, a gamer and designer, trying to buy a new monitor for his workstation. He keeps seeing specs like 1920x1080 pixels, 2560x1440, and DPI 109, but he has no idea how these numbers translate into actual screen size. Is it big enough for gaming? Will his graphics look sharp?

This is where the Screen Size Calculator comes in. By entering your screen width, height in pixels, and optionally the DPI, the calculator tells you the diagonal size, width, height, and aspect ratio of your display. No guesswork, no confusion — just accurate numbers so you can choose the right screen.

Why This Calculator Matters

• Buying monitors or TVs online: Pixels alone don’t tell you the physical size.
  
• Comparing devices: Know the actual dimensions of multiple screens.
  
• Design & development: Developers and designers need exact dimensions to plan layouts.
  
• Gaming & productivity: Choose screens that match your workspace and ensure comfortable viewing.
  
• Understanding resolution & DPI: Helps you see if a display will be sharp or blurry at a given size.
  

What the Parameters Mean

• Screen Width (pixels): The number of horizontal pixels in your display. Example: 1920 for Full HD.
  
• Screen Height (pixels): The number of vertical pixels. Example: 1080 for Full HD.
  
• Screen DPI (optional): Dots per inch. Measures how many pixels fit in one inch; higher DPI means sharper images. If not known, the calculator can still estimate relative dimensions.
  

The Formula Behind the Calculator

1. Calculate Diagonal in Pixels:
   

Diagonal_pixels = √(Width_pixels² + Height_pixels²)

2. Convert Pixels to Inches (if DPI known):
   

Diagonal_inches = Diagonal_pixels ÷ DPI

Width_inches = Width_pixels ÷ DPI

Height_inches = Height_pixels ÷ DPI

3. Aspect Ratio:
   

Aspect Ratio = Width_pixels ÷ Height_pixels

• Simplified to the nearest common ratio (e.g., 16:9, 4:3).
  

How the Calculator Works Step by Step

1. Enter your screen width in pixels (horizontal).
   
2. Enter your screen height in pixels (vertical).
   
3. Optional: Enter DPI if you know it; if not, the calculator still estimates relative dimensions.
   
4. Press calculate.
   
5. Get results:
   
   • Diagonal size in inches or cm
     
   • Screen width and height in inches or cm
     
   • Aspect ratio for proper scaling and compatibility
     

Example:

• Width = 1920 px
  
• Height = 1080 px
  
• DPI = 109
  

Diagonal_pixels = √(1920² + 1080²) ≈ 2202 px  

Diagonal_inches = 2202 ÷ 109 ≈ 20.2 in  

Width_inches = 1920 ÷ 109 ≈ 17.6 in  

Height_inches = 1080 ÷ 109 ≈ 9.9 in  

Aspect Ratio = 1920 ÷ 1080 ≈ 16:9

This tells Alex exactly how large the screen is physically and ensures he buys the correct size for his desk.