Video Aspect Ratio Calculator
Calculate video dimensions for any aspect ratio. Find the right width and height for YouTube (16:9), TikTok (9:16), Instagram (1:1), and more.
Instant calculation
Enter width or height and get the matching dimension instantly.
Common presets
Click any preset size for YouTube, TikTok, Instagram, and more.
Custom ratios
Enter any custom aspect ratio like 3:2 or 5:4 for unique formats.
What is Video Aspect Ratio Calculator?
The Video Aspect Ratio Calculator is a free browser-based tool that calculates, converts, and checks video dimensions for any aspect ratio. Whether you need to know what resolution a 9:16 video should be at 1080p, what width a 16:9 video should be at 1440px height, or what aspect ratio your current video dimensions represent, the calculator handles it instantly. It includes presets for all major social media platforms — TikTok (9:16), YouTube (16:9), Instagram (1:1, 4:5), and more — with the exact pixel dimensions for each.
How to use Video Aspect Ratio Calculator
- Step 1: Select your starting input — enter width and height, or select a preset platform ratio.
- Step 2: The calculator instantly shows the aspect ratio, suggested resolutions, and platform compatibility.
- Step 3: Use the resolution calculator to find what width or height you need for a specific aspect ratio.
- Step 4: Check the platform preset list to see which major platforms your current dimensions match.
- Step 5: Use the calculated dimensions when exporting from video editing software.
Tips for better results
- Always export at even pixel dimensions. Video encoders require even (divisible by 2) pixel dimensions. 1279×719 will cause export errors — use 1280×720. The calculator automatically rounds to even numbers.
- 16:9 is the universal standard for horizontal video. YouTube, Facebook Watch, and desktop displays all use 16:9. Common resolutions: 1920×1080 (Full HD), 1280×720 (HD), 3840×2160 (4K).
- 9:16 is the universal standard for vertical video. TikTok, Instagram Reels, YouTube Shorts, and Stories all use 9:16. Common resolutions: 1080×1920 (HD vertical), 720×1280 (standard vertical).
- 4:5 is optimal for Instagram feed posts. The 4:5 ratio (1080×1350px) occupies the most vertical space in Instagram's feed without being cropped — giving you maximum visual real estate per post.
- Use 1:1 square for carousels. Instagram and LinkedIn carousels display most consistently in square (1:1) format. 1080×1080px is the standard square resolution.
- Check aspect ratio before editing. Before starting a video project in your editor, verify your footage aspect ratio matches your intended output. Mismatched ratios require cropping or letterboxing in post-production.
Frequently Asked Questions
What aspect ratio should I use for TikTok?
TikTok uses 9:16 vertical aspect ratio. The recommended resolution is 1080×1920px (Full HD vertical). Minimum resolution is 720×1280px. Videos in other aspect ratios will have black bars or be automatically cropped by TikTok.
What is the aspect ratio for YouTube videos?
YouTube uses 16:9 horizontal aspect ratio. Standard resolutions are 1920×1080 (1080p Full HD), 1280×720 (720p HD), 2560×1440 (1440p QHD), and 3840×2160 (4K Ultra HD). YouTube will add black bars to videos in other aspect ratios.
What does aspect ratio mean?
Aspect ratio is the proportional relationship between the width and height of a video or image, expressed as two numbers separated by a colon (e.g. 16:9 means for every 16 units of width, there are 9 units of height). It determines the shape of the video frame.
Is the Video Aspect Ratio Calculator free?
Yes. Completely free with no signup and no usage limits.
How do I change the aspect ratio of my video?
To change a video's aspect ratio, use a video editor to crop or resize the footage to the new dimensions. Use the TikTok Video Resizer for 9:16 conversion, or the YouTube Thumbnail Resizer for 16:9 conversion.