Aspect Ratio Calculator
Use this free aspect ratio calculator to work out the aspect ratio of an image or screen and the new height for a new width. Enter your numbers and the results update as you type. It runs in your browser, so nothing you enter is uploaded, and there is nothing to sign up for.
Runs in your browser. Your files never leave your device.
How it works
- 01Enter your numbers in the fields.
- 02The results update as you type.
- 03Change a value to compare what-if cases.
Questions
How do I keep the aspect ratio when resizing?
Multiply the new width by the original height and divide by the original width to get the matching new height.
Is my data saved or sent anywhere?
No. The calculation runs in your browser and nothing is uploaded.
Are the results exact?
The maths is exact for the values you enter, but real life can differ. Use the result as a guide.
Is my file uploaded to a server?
No. Everything happens inside your browser on your own device. Your files are never sent to us or anyone else.
Is it free?
Yes. It is free to use, with no signup, no watermark and no daily limit.