Aspect Ratio Calculator

Calculate aspect ratio from width and height

Dimensions
×
Results
16:9
1.78:1
1920×1080

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What is Aspect Ratio?

Aspect ratio is the proportional relationship between width and height. Written as width:height, it's used in screens, images, and videos. Common ratios include 16:9 (widescreen), 4:3 (standard), and 21:9 (ultrawide). Our calculator uses the GCD algorithm to find the simplest ratio.

Frequently Asked Questions

How do you calculate aspect ratio?
Find the GCD (Greatest Common Divisor) of width and height. Divide both numbers by the GCD. For 1920×1080, GCD is 120, giving 16:9. This ensures the simplest whole number ratio.
What's the difference between 16:9 and 4:3?
16:9 is widescreen, common in HDTVs and modern monitors. 4:3 is the traditional TV and computer monitor shape. 16:9 gives 33% more horizontal viewing area than 4:3.
Why use aspect ratio in design?
Maintaining aspect ratio prevents image distortion when resizing. It's crucial for responsive design, video playback, and ensuring visual consistency across different screen sizes.