FREE TOOL
Aspect Ratio Calculator
Calculate the aspect ratio of any dimensions, or find a missing width or height from a known ratio. Includes common ratio presets.
Aspect Ratio
16:9
Decimal Ratio
1.7778:1
Inverse
1:0.5625
Common Ratios
Frequently Asked Questions
What is an aspect ratio?
An aspect ratio is the proportional relationship between a width and height expressed as two numbers separated by a colon, such as 16:9. It describes the shape of a rectangle regardless of its actual size.
What aspect ratio is 1920x1080?
1920x1080 has an aspect ratio of 16:9. It is the standard for HD and Full HD displays, YouTube videos, and modern monitors and televisions.
How do I calculate a missing dimension?
Switch to From Ratio mode, enter the ratio (e.g. 16 and 9), choose whether you know the width or height, enter the known value, and the calculator shows the missing dimension.
What does 21:9 mean?
21:9 is the ultrawide aspect ratio used by cinema displays and ultrawide monitors. It is significantly wider than standard 16:9 and reduces the black bars seen in widescreen films.
What is the aspect ratio for Instagram posts?
Instagram supports multiple ratios. Square posts are 1:1. Portrait posts are 4:5 (the maximum allowed). Landscape posts are 1.91:1 (approximately 16:9).
Is the aspect ratio calculator free?
Yes. Completely free with no sign-up required.
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