Aspect ratio and proportions
Calculate an aspect ratio and the height for a new width.
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How we handle your data →How to use this tool
- Enter original width and height using the same unit.
- Enter the new width and calculate proportional height.
- Round to whole pixels if the destination program requires it.
An example you can verify
Keep a design’s proportions when changing its width.
Example input
Width: 1920 Height: 1080 New width: 1280
Expected result
Ratio 16:9; new height 720.
Use the same unit throughout. Open Resize image to modify the actual image file.
Settings and limits
Enter the original width and height and a new width. For example, 1920 × 1080 is 16:9; a width of 1280 gives a height of 720. Use the same unit throughout.
Frequently asked questions
Are decimals supported?
Yes. Integer dimensions produce a simplified ratio; decimal ratios retain their values. Dimensions must be positive.