Proportional Resize Dimensions
Calculate the height needed to preserve an image or video’s proportions at a new target width. This plans dimensions; it does not resize a file.
How to use Proportional Resize Dimensions
- Enter “Original width”, using the units and limits shown in its label.
- Enter “Original height”, using the units and limits shown in its label.
- Enter “Target width”, using the units and limits shown in its label.
- Select Calculate or Process. Review the result and any validation message before copying or downloading available output. Reset clears the result and restores the starting inputs.
Method & assumptions
Target height = original height × target width / original width.
Worked example
1920 × 1080 resized to width 1280 needs height 720.
Results and projections are informational estimates, not financial, medical, legal, tax, or property advice. Check assumptions, units, rounding, and local requirements independently. Investment illustrations do not guarantee returns. Keep original files and check transformed output before use.
Questions, answered
Why might height be fractional?
Exact proportions can fall between pixels. Round for export and observe codec requirements such as even-numbered video dimensions.
Where does this calculation run?
It runs locally in your browser. Enter plain numbers without currency symbols or thousands separators; use the same currency and measurement units throughout unless a converter explicitly asks for units.