Aspect Ratio Helper
Simplify an aspect ratio and calculate a proportional height at a new width. Resize a graphic or video without stretching it. Enter original dimensions and a target width; the calculator returns the matching height.
Use the tool
Enter your values, then run it. The result is generated in your browser.
Result
Calculated
How to use Aspect Ratio Helper
- Enter original dimensions in the same unit.
- Enter the desired width.
- Keep aspect ratio locked in your editor when resizing.
Formula and assumptions
Height = target width × original height ÷ original width. Aspect ratio = width ÷ height.
Ratio simplification rounds fractional dimensions to whole numbers. This tool does not resize image files.
Frequently asked questions
What is 16:9?
A width of 16 units for every 9 units of height.
Can I use different units?
Original width and height must share a unit; the target dimension may be interpreted in your chosen output unit.
Does this edit the image?
No, it only calculates dimensions.
About this tool
Resize a graphic or video without stretching it. Enter original dimensions and a target width; the calculator returns the matching height.
No account is required. The tool runs in this browser and this starter build has no form-submission backend. See the method and assumptions before relying on estimates.