Aspect Ratio Calculator
Compute, simplify and scale aspect ratios for video and images.
How to use this tool
- Enter width and height (or a ratio like 16:9).
- Choose to simplify, scale to a new width/height, or compare.
- Read the result.
How it works
GCD simplifies a width/height pair to lowest terms; scaling multiplies the ratio to hit a target dimension.
Tips
- Before crop, decide the deliverable ratio — social media wants 4:5, cover art 1:1, YouTube 16:9.
- Scaling preserves the ratio, so no distortion.
Limitations
Non-standard ratios (odd numbers) simply stay as-is.
Frequently asked questions
How do I get 16:9 from 1920x1080?
Divide width and height by their greatest common divisor (1920/120=16, 1080/120=9). The tool does this.
How do I scale a ratio to a width?
Height = width / (ratioW/ratioH). To keep 16:9 at 1280 wide, height = 720.
Can I compare two dimensions?
Enter two sizes and the tool reports whether they share the same ratio.