Display Aspect Ratio Calculator
Find the aspect ratio of a display resolution, such as 16:9 for 1920 x 1080 or 21:9 for 2560 x 1080.
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 ultrawide?
Ultrawide displays are usually 21:9, wider than the standard 16:9 widescreen ratio.