toolkit.video

Aspect Ratio Calculator

Calculate and convert aspect ratios for any video platform. Get the perfect dimensions for YouTube, TikTok, Instagram, and more.

How It Works

  1. 1.Enter your video width and height in pixels
  2. 2.Or select a preset ratio (16:9, 9:16, etc.)
  3. 3.Lock the ratio to scale proportionally
  4. 4.Copy the calculated dimensions

Use Cases

  • •Video editors resizing footage for different platforms
  • •Content creators converting horizontal to vertical video
  • •Web developers calculating responsive video embeds
  • •Designers determining crop dimensions

About This Tool

Understanding aspect ratios is essential for creating professional video content that looks great across all platforms. Each social media platform has preferred dimensions — YouTube favors 16:9 widescreen, TikTok and Instagram Reels use 9:16 vertical, while Instagram feed posts perform best at 1:1 or 4:5. Getting these dimensions wrong can result in awkward cropping, black bars, or reduced visibility in feeds.

Our aspect ratio calculator eliminates the guesswork from video resizing. Enter any dimension and instantly see the proportional width or height needed to maintain your chosen ratio. The tool includes presets for all major platforms, making it easy to convert footage between horizontal and vertical formats while preserving visual quality and composition.

FAQ

What aspect ratio should I use for YouTube?

YouTube recommends 16:9 (1920×1080). YouTube Shorts use 9:16 vertical format.

What's the best ratio for Instagram?

Feed posts: 1:1 or 4:5. Stories/Reels: 9:16. Landscape: 16:9. Portrait 4:5 takes up the most feed space.

What ratio does TikTok use?

TikTok uses 9:16 (1080×1920). This fills the entire phone screen for the best viewing experience.

How do I convert 16:9 to 9:16?

You'll need to crop or add padding. Cropping loses content from the sides; padding adds black bars top/bottom. Consider reframing for vertical.

What resolution should I use for 4K?

4K at 16:9 is 3840×2160. At 9:16 vertical, it's 2160×3840. Most platforms compress to 1080p anyway.