Aspect Ratio Calculator
Enter just one side of a target ratio like 16:9 and the other is calculated automatically
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
Set a target ratio like 16:9 or 4:3, then enter just the width or height and the other side is calculated automatically to match the ratio. It's useful for anyone who needs a size that keeps a ratio, such as resizing videos and images, making thumbnails and banners, or checking monitor resolutions.
How to use
- Enter the width:height ratio directly, or tap a preset button like 16:9 or 4:3.
- Enter whichever value you know, width (px) or height (px).
- The other side is calculated automatically to match the ratio, and the resulting resolution and simplified ratio are shown together.
FAQ
- Can I change both the width and height?
- Yes. It recalculates the other side based on the field you entered last. Enter the width and the height adjusts; enter the height and the width adjusts automatically.
- Why is the result a decimal?
- Depending on the target ratio and your input, it may not come out evenly, so it's shown to two decimal places. When using actual pixels, round it to a whole number.
- Is the value I enter sent to a server?
- No. Ratio calculations happen entirely in your browser, and the sizes and ratios you enter are never sent to a server.