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Calculate and convert image and video aspect ratios instantly. Find the right dimensions for any platform, from Instagram to YouTube. Free, no signup required.
Enter the width and height of your image or video to find its aspect ratio.
Preview
16:9
Aspect ratio describes the proportional relationship between the width and height of an image or video. It is expressed as two numbers separated by a colon, such as 16:9 or 4:3. A 16:9 image is 16 units wide for every 9 units tall, regardless of the actual pixel dimensions. Understanding aspect ratios is essential for creating content that displays correctly across different platforms, devices, and screen sizes without unwanted cropping or black bars.
Each platform has preferred dimensions. Using the correct aspect ratio ensures your content fills the screen without being cropped or letterboxed.
| Ratio | Common Use |
|---|---|
| 1:1 | Instagram square post, profile pictures |
| 4:5 | Instagram portrait post (1080x1350) |
| 9:16 | Stories, Reels, TikTok, YouTube Shorts |
| 16:9 | YouTube videos, presentations, Twitter images |
| 3:2 | Standard photography |
| 4:3 | Traditional TV, iPad display |
| 2:3 | Pinterest pins |
| 21:9 | Ultra-wide cinematic |
The best aspect ratio depends on where your content will be displayed. For social media, check the platform's recommended dimensions: vertical 9:16 for Stories and Reels, 16:9 for YouTube, and 1:1 or 4:5 for feed posts. For print and photography, 3:2 and 4:3 are the most common standards.
When repurposing content across platforms, you may need to crop or reframe your original media. Use this calculator to find the exact pixel dimensions for any target ratio, so you can resize without distortion. If you are working with video, locking in the correct ratio before editing saves time and prevents quality loss from re-encoding.
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