Free Aspect Ratio Calculator
Calculate and convert aspect ratios for any video platform. Get the perfect dimensions for YouTube, TikTok, Instagram, and more.
16:9
1920 × 1080 px
16:9
HOW IT WORKS
- Enter your video width and height in pixels
- Or select a preset ratio (16:9, 9:16, etc.)
- Lock the ratio to scale proportionally
- Copy the calculated dimensions
USE CASES
- Video editors resizing footage for different platforms
- Web developers calculating responsive video embeds
- Content creators converting horizontal to vertical video
- 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 well at 1:1 or 4:5.
This calculator helps you quickly convert between ratios, scale proportionally, and avoid awkward cropping, black bars, or reduced visibility in feeds.
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 works but may appear smaller in feeds.
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 can resize and crop. Cropping loses content from the sides; padding adds black bars top/bottom. The best choice depends on your footage.
What resolution should I use for 4K?
4K at 16:9 is 3840×2160. At 9:16 vertical, it's 2160×3840. Many platforms compress to 1080p anyway.