Aspect Ratio Calculator
Reduce image or video dimensions to a ratio and calculate a proportional output size.
Paste text or open a fileOr start from an example:
Proportional size
The result appears here.
Ctrl+↵ copy result · Ctrl+Shift+F result to input
How to use Aspect Ratio Calculator
- Enter source dimensions as width × height.
- Set a target width.
- Read the reduced ratio and calculated height.
Frequently asked questionsUseful details
2 answers +
How is height rounded?
To the nearest whole pixel, with a minimum of one pixel.
Does this resize a file?
This calculator gives dimensions. Use Image Resizer or Resize Video to process a file.
More help
Guides, common conversions and useful next steps.
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