Video Aspect Ratio Calculator
Enter your dimensions or pick a preset — the calculator keeps everything in proportion.
Quick presets
Dimensions
1920 × 1080
Simplified Ratio
16:9
Visual proportion preview
YouTube Video Dimensions Guide
The standard YouTube video aspect ratio is 16:9, with the recommended resolution being 1920×1080 for full HD. YouTube also supports 1280×720 (HD), 854×480 (SD), and 4K at 3840×2160. All are 16:9 and will display without black bars on standard screens.
For YouTube Shorts, use a 9:16 vertical aspect ratio at 1080×1920. Uploading horizontal videos to Shorts will add black bars on the sides, which reduces engagement significantly.
How to Use This Calculator
Enter a width and the height updates automatically to match your chosen ratio. Enter a height and the width updates. Change the ratio field to any custom ratio like 4:5 or 2:1 and the dimensions recalculate instantly. Use the presets to jump to common YouTube and social media formats.