100% Free online calculator
Aspect Ratio Calculator
Calculate target width or height, scale image dimensions, and simplify aspect ratios of screens and photos in real-time.
Configure Ratio
Ratio Aspect Preview (16:9)
16:9
The preview box displays target scaling relative to a square boundary.
Calculate New Dimensions
Change either Width or Height to calculate the matching dimension locked to 16:9.
Simplify Existing Size
Enter actual screen or image dimensions to find their simplified aspect ratio (using GCD).
Simplified Ratio:16:9
Understanding Aspect Ratios
Aspect ratio is the proportional relationship between a shape's width and its height. It is expressed as two numbers separated by a colon, such as 16:9. This means for every 16 units of width, there are 9 units of height. Knowing aspect ratios is critical for resizing images for social media, formatting screen layouts, or scaling video outputs without distorting the visual proportions.