Aspect Ratio Calculator
Calculate the aspect ratio of an image or video, or find the missing dimension.
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Aspect Ratio:
16:9
Common Presets:
Pro Tip: Use these dimensions in Medrea to precisely crop or compress your videos for different platforms.
Common Aspect Ratios Explained
The aspect ratio describes the proportional relationship between the width and height of an image or video screen. Understanding these ratios is vital for filmmakers, photographers, and social media content creators.
16:9 (Widescreen)
The standard for HDTV, YouTube, and most desktop screens. Typical resolutions: 1920x1080 (1080p), 3840x2160 (4K).
9:16 (Vertical)
The standard for mobile storytelling. Used by TikTok, Instagram Reels, and YouTube Shorts. Perfect for full-screen phone viewing.
4:3 (Standard)
The classic TV and computer monitor ratio. Still used in photography (Micro Four Thirds cameras) and for "retro" style videos.
1:1 (Square)
Popularized by Instagram feeds. It occupies the same amount of screen space regardless of whether the user is holding their phone vertically or horizontally.
Why Aspect Ratio Matters
Uploading a video with the wrong aspect ratio can result in black bars (letterboxing) or awkward cropping that cuts off important content.
Need to fix your video's dimensions? Our Medrea App allows you to crop, resize, and compress your videos directly on your iPhone or iPad, ensuring they look perfect on every platform while keeping your files private.