Calculate dimensions based on aspect ratio. Useful for designers, developers, and video editors.
Free online Aspect Ratio Calculator. Calculate width or height based on 16:9, 4:3, 21:9 and other common aspect ratios. Essential tool for responsive design and video editing.
Enter the known width or height.
Select a common aspect ratio (e.g., 16:9) or enter a custom one.
The tool automatically calculates the missing dimension.
Use the result for your design or video project.
Aspect Ratio is the proportional relationship between the width and height of an image or screen.
The standard aspect ratio for YouTube videos is 16:9. Vertical Shorts use 9:16.