How to use this image tool
Calculate simplified aspect ratio and proportional resize dimensions from width and height.
How the browser processing works
- Finds the greatest common divisor of width and height.
- Divides both dimensions to produce a simplified ratio.
- Calculates a missing proportional dimension from a new width.
Formula
Simplified ratio = width / gcd(width, height) : height / gcd(width, height).
Example
1920 x 1080 simplifies to 16:9, and 1080 x 1080 simplifies to 1:1.
Using your output
Use the simplified ratio and proportional dimensions to plan resizing, cropping, thumbnails, and layouts.
Assumptions and limitations
- This is deterministic math and does not require an uploaded file.
- Use it with image resizing or cropping decisions.
Frequently asked questions
What does 16:9 mean?
It means the width has 16 parts for every 9 parts of height.
Can this calculate proportional dimensions?
Yes. Enter an original width and height, then enter a new width to calculate the proportional height.