Developer
Aspect Ratio Calculator
Calculate image and video aspect ratios and scale dimensions proportionally.
How to use this tool
Enter the original width and height to simplify the ratio. Add a target width to calculate its matching height without stretching.
Related tool: Image Resizer →When to use the Aspect Ratio Calculator
Use it when you need an image or video to fit a fixed frame, such as a 16:9 hero banner or a 1:1 social post, without stretching it.
Examples
- A 1920×1080 video is 16:9; at 1280 px wide it becomes 1280×720.
- Scale a 4:3 product photo to 800 px wide and get the matching 600 px height.
Common mistakes
- Rounding the second dimension to a value that is no longer the original ratio.
- Using the display size of an image instead of its real pixel size.