Aspect Ratio Calculator
Calculate a new width or height that preserves an aspect ratio.
Resizing an image or video without distorting it means keeping its aspect ratio — the fixed relationship between width and height. Set a new width and the height has to follow, or a stretched, squashed result gives you away. Doing that math for arbitrary dimensions is fiddly.
Enter your original width and height and one new dimension, and this calculator gives the other dimension that preserves the ratio, along with the simplified ratio itself (like 16:9). It's built for resizing media, planning layouts and matching video formats.
How to use Aspect Ratio Calculator
- 1
Enter your details
Fill in the fields above.
- 2
See the result
It updates instantly.
- 3
Adjust to explore
Change any value to compare.
Features
- Instant results
- Runs privately in your browser
- Clear, itemized output
Frequently asked questions
Common mistakes to avoid
- Entering values in inconsistent units.
- Treating an estimate as an exact figure.
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