Aspect Ratio Calculator
Find the aspect ratio of any width and height, such as 16:9, and work out a new width or height that keeps the same shape.
Free · No upload · 100% on your device
How to use Aspect Ratio Calculator
- Choose the settings in the side panel.
- The result updates instantly. Select “Calculate” for a fresh one.
- Copy the result or download it.
Private by design. Everything you type, open or record is processed in this browser tab and is never uploaded to KittySuite.
About Aspect Ratio Calculator
Enter the original size, then a new width or a new height to get the matching other side. Ratios close to a standard such as 16:9 or 1.91:1 are named. The table lists the same shape at common screen sizes.
Everything is calculated in this browser tab and nothing you enter is sent anywhere. It keeps working offline once the page has loaded.
Aspect Ratio Calculator: frequently asked questions
How do I find the aspect ratio of a size?
Enter the width and height. The ratio is simplified, and sizes close to a standard such as 16:9 or 1.91:1 are named.
How do I keep the same shape at a new width?
Enter the new width (or height) and the matching other side is calculated.
Can I see common sizes for my ratio?
Yes. A table lists the same shape at common screen sizes.
How do I actually resize the image?
Use Resize Image with the numbers you calculated.