Aspect ratio calculator
Enter a width and a height. Add a new width, a new height, or both, to see the matching side.
- Width and height
- Free, no sign-up
Free to use, no account. More everyday tools
How to use it
- Enter the current width and height.
- Enter a new width to get the height, or a new height to get the width.
- Leave a new side blank if you only want the ratio.
How the ratio is simplified
The page divides the rounded width and height by their greatest common divisor, so 1920 by 1080 becomes 16:9. A new width keeps that ratio: height = new width × original height / original width.
If you fill both new sides, you get both results. They will disagree if the two new sides are not the same ratio.
Private by design
Privacy
The numbers stay in this tab and are not uploaded.
Questions
Does it crop the image?
No. It only computes the numbers. Crop in an editor.
Why is 1920×1080 shown as 16:9?
Both sides divide by 120.
Can I use centimetres?
Yes. The unit cancels out. Use the same unit for width and height.