Aspect Ratio Calculator
Resize dimensions while keeping the same ratio.
Keep images and videos proportional. Enter your original width and height to see the simplified ratio (like 16:9), then scale to a new width or height and get the matching dimension automatically.
:= 16:9 · 1.778
Runs entirely in your browser — nothing is uploaded.
How to use the aspect ratio calculator
- 1Enter the original width and height.
- 2Enter a new width to get the height (or a new height to get the width).
- 3Use the proportional result.
Frequently asked questions
What is an aspect ratio?
It's the proportional relationship between width and height, written like 16:9. Keeping it constant stops images and videos from looking stretched.
How is the ratio simplified?
The width and height are divided by their greatest common divisor — so 1920×1080 simplifies to 16:9.