Aspect Ratio Calculator
Find the aspect ratio of a size, and scale it to a new width or height without distortion.
Your result will appear here as soon as you add some input.
How to use it
- 1Enter your values in the fields above.
- 2The answer and the working appear immediately below.
- 3Check the working to see the formula with your numbers substituted.
About the Aspect Ratio Calculator
The ratio is reduced by the greatest common divisor, so 1920x1080 reports as 16:9 rather than 1920:1080.
Entering a new width or height gives the other dimension that preserves the ratio. That is the calculation behind resizing an image without stretching it.
The closest standard ratio is also named, which is useful when a size is almost but not quite 16:9 - usually a sign of a crop that was done by eye.
Questions people ask
Is your figures uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your figures never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.