Aspect Ratio Calculator
Resize images and videos while keeping the correct proportions. Instantly calculate new dimensions for 16:9, 4:3, and social media.
1. Original Dimensions
Detected Ratio:
16:9
2. Resize To (New Dimensions)
Enter one value, we calculate the other.
Visual Preview
16:9
This shape represents your content's proportions.
Common Aspect Ratios Explained
Aspect ratio is the proportional relationship between the width and height of an image or video. It is usually expressed as two numbers separated by a colon, like 16:9.
| Ratio | Common Use Case | Example Resolution |
|---|---|---|
| 16:9 | YouTube, HDTV, Standard Widescreen | 1920 x 1080 |
| 9:16 | TikTok, Instagram Reels, YouTube Shorts | 1080 x 1920 |
| 4:3 | Old CRT TVs, iPads, Standard Photography | 1024 x 768 |
| 1:1 | Instagram Feed Posts (Square) | 1080 x 1080 |
| 21:9 | Ultrawide Monitors, Cinematic Movies | 2560 x 1080 |
How to Calculate Aspect Ratio Manually
The formula to find the aspect ratio is simple simplification of fractions. To find the new height when you have the width:
New Height = (Original Height / Original Width) * New Width