Aspect Ratio Calculator
Find the simplified ratio from any width and height, or compute a missing dimension for a target ratio like 16:9 or 4:3.
Ratio from width & height
Ratio
Find a missing dimension
Result
How is the ratio simplified?
The width and height are divided by their greatest common divisor, so 1920×1080 simplifies to 16:9 and 1080×1920 simplifies to 9:16.
Is my data uploaded anywhere?
No — every calculation happens instantly in your browser. Nothing is sent to a server.
Can I compute a missing width or height?
Yes — pick a preset ratio (or enter your own), choose which dimension you already know, and the other one is calculated for you.