About Aspect Ratio Calculator
The Aspect Ratio Calculator helps you find the exact ratio of any video resolution, scale dimensions while preserving the ratio, and visually compare the most common aspect ratios used in film, TV, and social media.
What Is an Aspect Ratio?
An aspect ratio describes the proportional relationship between the width and height of a video frame. It is expressed as W:H โ for example, 1920ร1080 pixels has a 16:9 ratio. Aspect ratios determine how a video appears on different screens and are critical for avoiding black bars, cropping, or distortion.
Common Aspect Ratios
16:9 (Widescreen): The universal standard for HD video, YouTube, streaming platforms, and modern TV. Examples: 1920ร1080, 1280ร720, 3840ร2160. 4:3 (Classic TV): The legacy standard for analog TV and early digital cameras. Still used in some photography and surveillance systems. 21:9 (Ultrawide/Cinema): Used in cinematic productions and ultrawide monitors. Provides a wide, immersive viewing experience. 1:1 (Square): The default format for Instagram feeds and some social platforms. 9:16 (Vertical): Standard for TikTok, Instagram Reels, YouTube Shorts, and all mobile-first content.
Scaling Video Dimensions
When resizing video for different platforms, always scale proportionally to avoid stretching or squishing. Enter your original resolution and target width or height โ the calculator automatically computes the other dimension to maintain your exact ratio.
Aspect Ratio and Platform Requirements
YouTube: 16:9 recommended (1920ร1080 or 3840ร2160). Instagram Feed: 1:1 (1080ร1080) or 4:5 portrait. TikTok / Reels: 9:16 (1080ร1920). Twitter/X: 16:9 (1600ร900 recommended). Cinema (DCP): 1.85:1 or 2.39:1 (Scope).