Aspect Ratio Calculator
Calculate and convert aspect ratios
Quick Conversions
About Aspect Ratios
Aspect ratio describes the proportional relationship between width and height. Common ratios include 16:9 (widescreen), 4:3 (traditional), 21:9 (ultrawide), 1:1 (square), and 3:2 (photography). Knowing the aspect ratio is essential for video production, responsive design, and image cropping.
Our calculator can simplify any width×height to its ratio, or compute the missing dimension given a ratio and one dimension.