Aspect Ratio Calculator
Calculate aspect ratios, resize images while maintaining proportions, or find the dimensions you need for any width or height. Essential for designers, photographers, and video editors.
Enter dimensions to calculate aspect ratio.
Common Aspect Ratios
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height. A 16:9 ratio means for every 16 units of width, there are 9 units of height. It's important for ensuring images and videos display correctly without stretching or cropping.
Why does 16:9 look different than 1920×1080?
They're the same ratio! 1920÷1080 = 16÷9 = 1.778. The simplified ratio (16:9) describes the shape, while pixels (1920×1080) describe the actual size. A 3840×2160 (4K) display is also 16:9—just more pixels.
What ratio should I use for social media?
It depends on the platform. Instagram feed: 1:1 (square) or 4:5 (portrait). Stories: 9:16. YouTube: 16:9. Twitter: 16:9 or 1:1. Facebook: 1.91:1 for links, 1:1 or 4:5 for posts. Check each platform's current guidelines as they change.