Aspect Ratio Calculator
Calculate and resize aspect ratios for images and video. Free W:H ratio tool with common presets.
Frequently asked questions
- How does it simplify a ratio?
- It divides the width and height by their greatest common divisor, so 1920 by 1080 becomes the familiar 16:9. The decimal form is shown as well.
- How do I resize while keeping the ratio?
- Enter a new width and the matching height is calculated automatically, which is useful for thumbnails, banners and video exports.
- What are the common presets?
- The tool lists the most used ones: 16:9 for video, 4:3 classic, 1:1 square, 9:16 vertical and 21:9 ultrawide.
- Does it work for print dimensions?
- Yes. Any pair of numbers works, so you can also use it to scale print layouts, not just pixels.
This tool runs entirely in your browser. No data is uploaded anywhere.