Calculate and convert aspect ratios for images, video, and screens.
Enter your original width and height to see the aspect ratio. Then enter a new width or height, and the calculator computes the other dimension to maintain the same ratio. Use presets for common ratios like 16:9 (widescreen), 4:3 (standard), or 1:1 (square).
16:9 is standard for HD video and modern monitors. 4:3 is the classic TV format. 1:1 is square for social media. 9:16 is vertical for stories and reels. 4:5 is popular for Instagram portraits.