Aspect Ratio Calculator for Video

An aspect ratio is the proportional relationship between a video's width and height, expressed as two numbers separated by a colon (e.g., 16:9). It's crucial for videos because different platforms and devices require specific aspect ratios. Using the wrong aspect ratio can result in black bars, cropped content, or distorted videos. For example, YouTube prefers 16:9, while TikTok and Instagram Stories use 9:16 vertical format.

To calculate aspect ratio from dimensions, divide both the width and height by their greatest common divisor (GCD). For example, a 1920×1080 video has a GCD of 120. Dividing both numbers by 120 gives you 16:9. Our calculator automatically performs this calculation for you, simplifying any dimensions into their most basic aspect ratio format.

YouTube's standard aspect ratio is 16:9, which is the widescreen format. The most common resolutions for this ratio are 1920×1080 (1080p), 2560×1440 (2K), and 3840×2160 (4K). YouTube will accept other aspect ratios, but 16:9 provides the best viewing experience without letterboxing or pillarboxing on most devices.

TikTok and Instagram Reels work best with a 9:16 vertical aspect ratio, which is optimized for mobile viewing. The recommended resolution is 1080×1920 pixels. This vertical format fills the entire mobile screen, providing an immersive viewing experience. While these platforms support other ratios, 9:16 maximizes engagement and visibility in users' feeds.

Yes, you can change aspect ratios without distortion by either cropping the video or adding letterboxing (black bars). Cropping removes portions of the frame to fit the new ratio, while letterboxing maintains the full frame with bars on the sides or top/bottom. Modern video editing tools like MyKaraoke Video can intelligently reformat videos to different aspect ratios while preserving the most important content.

For karaoke and lyric videos, 16:9 is ideal for YouTube and desktop viewing, while 9:16 works best for TikTok, Instagram Reels, and mobile-first platforms. Square 1:1 format is perfect for Instagram feed posts. The choice depends on your target platform. MyKaraoke Video supports all major aspect ratios and can automatically format your karaoke videos for any platform with AI-powered vocal removal and auto-synced lyrics.