Calculate aspect ratios instantly. Enter width and height to get the simplified ratio, decimal value, and common format names. Perfect for images, video, and responsive design. 100% client-side.
The Aspect Ratio Calculator helps designers, developers, and content creators quickly determine the proportional relationship between width and height. Simply enter any two dimensions and get the simplified ratio, decimal equivalent, and common format name. All calculations happen instantly in your browser — no data is ever sent to a server.
An aspect ratio is the proportional relationship between width and height, expressed as two numbers separated by a colon (e.g., 16:9). It describes how wide something is compared to how tall it is.
The calculator uses the Euclidean algorithm to find the Greatest Common Divisor (GCD) of the width and height, then divides both numbers by that value to get the simplest form.
Yes! Use the Reverse Calculator section. Enter your target ratio (e.g., 16:9) and one known dimension, and the calculator will compute the other.
Absolutely. All calculations are performed entirely in your browser using JavaScript. No data is transmitted to any server.