Free Image Tool
Image Aspect Ratio Calculator
Enter your original dimensions, lock the ratio, and instantly calculate the correct new width or height without distortion.
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Enter your original width and height above to get started
-Simplified Ratio
-Decimal Ratio
-New Width
-New Height
Common Aspect Ratios
| Ratio | Common Use | Decimal | Orientation | |
|---|---|---|---|---|
| 16:9 | YouTube, HD video | 1.7778 | Landscape | |
| 4:3 | Old TV, presentations | 1.3333 | Landscape | |
| 1:1 | Instagram square | 1.0000 | Square | |
| 9:16 | Instagram Stories, TikTok | 0.5625 | Portrait | |
| 4:5 | Instagram portrait | 0.8000 | Portrait | |
| 3:2 | DSLR photos | 1.5000 | Landscape | |
| 2:1 | Twitter header | 2.0000 | Landscape | |
| 21:9 | Ultrawide banner | 2.3333 | Landscape |
Tips for resizing images correctly
Always lock the ratio to prevent stretching or squishing
16:9 is the standard for blog featured images and YouTube thumbnails
Use 1:1 for social profile pictures and Instagram grid posts
9:16 is ideal for Instagram Stories, Reels, and TikTok videos
Upscaling beyond 2x original size causes visible quality loss
Convert to WebP after resizing to reduce file size by up to 30%
