Calculate and convert image aspect ratios, find new dimensions while maintaining proportions, and preview ratios visually. Perfect for photography, video production, and web design.
Aspect ratio is the proportional relationship between an image's width and height. It's expressed as two numbers separated by a colon, like 16:9 or 4:3. Understanding aspect ratios is crucial for maintaining image quality when resizing, ensuring your content looks perfect on different screens and platforms.
Different aspect ratios serve different purposes. 16:9 is the standard for HD video and most modern displays. 4:3 was common for older TVs and monitors. 1:1 square format is popular on social media. 21:9 is used for ultra-wide cinematic displays. Choose the right ratio based on your intended use.
To calculate aspect ratio, divide both width and height by their greatest common divisor (GCD). For example, 1920÷1080 has a GCD of 120, resulting in 16:9. Our calculator does this automatically and can also convert between ratio formats like fractions, decimals, and percentages.
When resizing images, maintaining the aspect ratio prevents distortion. If you know one dimension and the aspect ratio, you can calculate the other dimension. Use our resize mode to automatically calculate proportional dimensions for any aspect ratio.
Social media platforms have preferred aspect ratios. Instagram posts work best at 1:1 or 4:5, Stories use 9:16, YouTube videos are typically 16:9, and Twitter images can be 16:9 or 2:1. Using the correct ratio ensures your content displays properly without cropping.
Our calculator offers advanced features including visual preview, image upload for automatic ratio detection, conversion between different ratio formats, and preset ratios for common use cases. The lock feature maintains proportions when entering custom dimensions.