Aspect ratio calculator
Resize dimensions without distorting the proportions.
Enter your original width and height, then change either new value to get the matching one.
Aspect ratio
16:9
Calculates live as you type. Nothing is uploaded.
How to use this tool
- Enter the original width and height.
- Type a new width to get the matching height, or a new height to get the width.
The formula
new height = new width x (original height / original width)
A real example
A 1920 by 1080 image needs to fit a 1280 pixel wide slot without stretching. Entering the new width gives the exact height that keeps it sharp and correctly proportioned.
Common questions
What does the ratio mean?
It is the width and height reduced to their simplest whole-number form, like 16:9, which is handy for matching standard screen and video formats.