Aspect Ratio Calculator
Keep the same proportions when resizing. Enter original size and a new width to get the matching height.
New height720
Aspect ratio16 : 9
How to use
Enter the original width and height, then a new width.
How it works
New height = new width ÷ (original width ÷ original height).
Frequently asked questions
What's a common ratio?
16:9 for video, 4:3 for classic screens.
Is it free?
Yes.