Aspect ratio calculator
Find a reduced aspect ratio and scale dimensions with a visual preview.
About Aspect ratio calculator
Reduce a pair of integer dimensions to their simplest ratio, then calculate a matching height for a target width. A proportional rectangle makes the selected shape visible.
Steps, and limitations
How to use it
- Enter source width and height, or choose a common ratio.
- Set a target width for proportional scaling.
- Read the reduced ratio and rounded target dimensions.
Things to know
- Dimensions are positive integers. The displayed target height is rounded to the nearest whole pixel.
- Video encoders may require even dimensions; consult the video resize preview for codec-safe output.