Aspect Ratio Calculator
Calculate image dimensions, find ratios, and resize content with a Live Preview
Edit one value, the other updates instantly.
Detected Ratio
-- : --
Live Visual Preview
16:9
1.77
Decimal Ratio
16 / 9
CSS Value
2 MP
Megapixels
How to use this Aspect Ratio Calculator
Understanding image aspect ratio is critical for digital creators. Whether you are resizing a video for Instagram Reels (9:16) or calculating the correct dimensions for a website banner, this tool ensures your content is never stretched or distorted.
Common Resolutions Reference
| Ratio | Platform / Use | Common Resolutions |
|---|---|---|
| 16:9 | YouTube, TV, Facebook Video | 1920x1080, 1280x720, 3840x2160 (4K) |
| 9:16 | TikTok, Instagram Stories, Shorts | 1080x1920, 720x1280 |
| 4:5 | Instagram Portrait Post | 1080x1350 |
| 1:1 | Profile Pictures, Square Posts | 1080x1080, 500x500 |
Why is Aspect Ratio Important?
If you upload a 16:9 video to a 1:1 platform without resizing, important details will be cropped out. Use our Dimension Calculator mode to find the exact width needed to match a specific height while keeping the ratio locked. This is especially useful for developers writing aspect-ratio: 16/9; CSS rules.