Reduced width:height ratio and the height that matches a target width.
| Ratio width | – |
| Ratio height | – |
| Scaled height | – |
Use this calculator when you crop a photo, scale a video, or pick a screen size and want the matching height.
The reduced ratio is width and height divided by their greatest common divisor (after rounding to whole numbers). 1920×1080 reduces to 16:9. Scaled height is (height / width) × target width, so 1280 wide keeps 720 high. Named ratios such as 4:3 work the same way. Units cancel; pixels, millimetres, or inches are fine as long as width and height share them. Print PPI is a conversion problem, not this tool.
Width: Current width in pixels or another length unit.
Height: Current height, same units.
Target width: New width; height follows the ratio.
Ratio width / height: Lowest whole numbers with the same proportion.
Scaled height: Height at the target width.
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