Aspect Ratio Calculator
Simplify any width and height to its lowest-terms aspect ratio, or find a missing dimension for a ratio such as 16:9 or 4:3.
Aspect ratio
16:9
Find a missing dimension
How to use this calculator
1. Enter width and height to get the simplified ratio. 2. Or pick a ratio and a known dimension to find the missing one.
Formula
Divide width and height by their greatest common divisor. Example: 1920 and 1080 share GCD 120, giving 16:9.
Frequently asked questions
What is 1920 x 1080 as a ratio?
Divide both numbers by their greatest common divisor, 120, to get 16:9.