Aspect Ratio Calculator
Lock your ratio and calculate exact pixel dimensions for width or height.
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Understanding Aspect Ratios
Aspect ratio refers to the proportional relationship between a video's width and its height.
- 16:9 is the standard widescreen format for almost all modern displays, YouTube, and broadcast TV.
- 9:16 is the standard for vertical video (TikTok, Instagram Reels, YouTube Shorts).
- 21:9 is ultrawide/cinemascope, often used in feature films.
Note on Mod-2: Video encoders (like H.264) strongly prefer dimensions that are divisible by 2 (or ideally 16, known as macroblocks). The calculator rounds to the nearest whole pixel, but you should manually ensure your final dimensions are even numbers to prevent encoder errors.