Aspect Ratio Calculator
Calculate aspect ratios for video and images. Enter width and get the correct height, or vice versa.
Aspect Ratio
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Calculate Dimensions
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16:9
Free Aspect Ratio Calculator
Calculate dimensions while maintaining aspect ratio for video, images, and responsive design. Select a preset ratio like 16:9, 4:3, or 1:1, or enter a custom ratio. Then enter either width or height to calculate the matching dimension. The visual preview updates in real time.
Common Aspect Ratios
16:9 is the standard for HD video, YouTube, and most monitors. 4:3 is the classic TV and presentation format. 1:1 is used for Instagram posts. 9:16 is the vertical video format for TikTok, Reels, and Stories. 4:5 is the Instagram portrait format that shows the largest image in feed. 21:9 is the ultrawide cinema format.