Aspect Ratio Calculator
Calculate image and video aspect ratios, resize while maintaining proportions, and compare common ratios
grid_view Common Aspect Ratios Reference
upload_file Analyze Image or Video File
Drop an image or video file to automatically detect its dimensions and aspect ratio.
Drop an image or video here
or click to browse
About the Aspect Ratio Calculator
Calculate and convert aspect ratios for images, videos, screens, and any rectangular dimensions. Whether you're designing for social media, video production, photography, or web development, this tool helps you understand and work with aspect ratios effectively.
Features
- Calculate Ratio — Enter any width and height to find the simplified aspect ratio (e.g., 1920×1080 → 16:9)
- Resize Calculator — Scale dimensions while maintaining the same aspect ratio
- Compare Ratios — Visual comparison of common aspect ratios side by side
- File Analysis — Drop an image or video to automatically detect dimensions
- Quick Presets — Common dimensions for HD, 4K, social media, and more
What is an Aspect Ratio?
An aspect ratio is the proportional relationship between width and height. It's expressed as two numbers separated by a colon (like 16:9) or as a decimal (like 1.778). Aspect ratio matters because:
- It determines how content fits different screens and platforms
- Resizing while maintaining aspect ratio prevents distortion
- Different platforms have specific ratio requirements
- Cinematic and creative choices often involve specific ratios
Common Aspect Ratios by Use Case
| Platform / Use | Recommended Ratio | Dimensions |
|---|---|---|
| YouTube Video | 16:9 | 1920×1080 or 3840×2160 |
| Instagram Feed (Square) | 1:1 | 1080×1080 |
| Instagram Feed (Portrait) | 4:5 | 1080×1350 |
| Instagram/TikTok Stories/Reels | 9:16 | 1080×1920 |
| Facebook/Twitter Link Preview | 1.91:1 | 1200×628 |
| Pinterest Pin | 2:3 | 1000×1500 |
| LinkedIn Post | 1.91:1 | 1200×627 |
| Cinema (Widescreen) | 2.39:1 | 1920×803 |
How to Calculate Aspect Ratio
To find the aspect ratio manually:
- Take the width and height values
- Find the Greatest Common Divisor (GCD) of both numbers
- Divide both width and height by the GCD
- The results are your aspect ratio (width:height)
For example: 1920×1080 → GCD is 120 → 1920÷120=16, 1080÷120=9 → 16:9
Privacy Notice
All calculations happen directly in your browser. No data is sent to any server. File analysis is performed locally using the browser's built-in APIs — your files never leave your device.