Screen Ratio Calculator
Calculate the aspect ratio of any screen from width and height. Get simplified ratio, decimal ratio, closest standard, and orientation with free online tool and charts.
About This Calculator
The Screen Ratio Calculator helps you determine the aspect ratio of any display, image, or video by entering its width and height in pixels. Whether you are a web designer resizing assets, a video editor framing content, a gamer checking monitor specifications, or a photographer preparing prints, this tool instantly computes the simplified aspect ratio using the greatest common divisor algorithm and matches it to standard screen ratios.
The calculator divides the width by the height to obtain the decimal ratio, then reduces both dimensions to their simplest integer form. For example, a resolution of 1920x1080 yields a simplified ratio of 16:9, a decimal ratio of 1.78, and is identified as the 16:9 (HD/FHD/4K) standard. The tool also detects whether your screen is in landscape or portrait orientation and provides a comprehensive breakdown table with all computed metrics.
This calculator supports all common screen ratios including 16:9 widescreen, 16:10 laptop displays, 4:3 legacy monitors, 21:9 ultrawide, 32:9 super ultrawide, 5:4 SXGA, and smartphone ratios such as 19.5:9. The bar and pie charts visualize the proportional relationship between width and height dimensions for quick comparison.
Regional Notes
India (IN): Common screen resolutions in India range from HD-ready (1366x768, 16:9) laptops to 4K (3840x2160) TVs. Budget monitors often use 1920x1080 panels.
United States (US): US consumers predominantly use 16:9 monitors and TVs. Ultrawide 21:9 monitors are popular among gamers and creative professionals. Smartphones use 19.5:9 and 20:9 ratios.
United Kingdom (UK): UK households commonly own 16:9 TVs for Freeview and streaming. Laptop screens are split between 16:9 and 16:10 ratios, with Apple devices using 16:10 on MacBooks.
Frequently Asked Questions
How do I calculate the screen ratio of my display?
Enter the width and height of your screen in pixels into the calculator. It automatically computes the simplified aspect ratio using the greatest common divisor and identifies the closest standard screen ratio such as 16:9, 4:3, or 16:10.
What is the difference between screen ratio and aspect ratio?
Screen ratio and aspect ratio are often used interchangeably. Both refer to the proportional relationship between the width and height of a display. The screen ratio is expressed as two numbers separated by a colon, such as 16:9 or 4:3.
What are the most common screen ratios?
The most common screen ratios are 16:9 (HD, FHD, 4K TVs and monitors), 16:10 (laptop screens), 4:3 (older monitors and projectors), 21:9 (ultrawide monitors), and 19.5:9 (modern smartphones like iPhone).
How do I find my screen resolution to calculate the ratio?
On Windows, open Display Settings and look for Display Resolution. On macOS, go to System Settings > Displays. On a Chromebook, go to Settings > Device > Displays. The resolution is shown as width x height in pixels.
What does 16:9 mean on a screen?
A 16:9 screen means the width is 16 units for every 9 units of height. This widescreen format is the standard for HDTV, Full HD (1920x1080), 4K (3840x2160), and most modern monitors and televisions worldwide.
Can I use this calculator for images and videos?
Yes, you can use this calculator for any rectangular image, video, or design canvas. Enter the pixel dimensions of your image or video frame, and the calculator will determine the aspect ratio for social media posts, thumbnails, or video projects.
What screen ratio do iPhones use?
Most modern iPhones (iPhone X through iPhone 15 series) use a 19.5:9 aspect ratio. Older iPhones such as the iPhone 8 and earlier used 16:9. The calculator automatically detects these standard ratios from your input dimensions.
How do I resize content to fit a specific screen ratio?
Once you know your target screen ratio, you can calculate the missing dimension. If you want to fit a 1920px wide image into a 16:9 ratio, divide 1920 by 16 and multiply by 9 to get a height of 1080px. The calculator shows both the simplified and decimal ratio to help with resizing.