What is an Aspect Ratio Calculator?
Resize without keeping the ratio and everything looks stretched. This calculator reduces any dimensions to their simplest ratio and computes matching sizes at any target width.
The preset table covers the ratios that matter: 16:9 video, 1:1 posts, 9:16 stories, each computed at your target width.
Frequently asked questions
What ratio is 1920×1080?
16:9: both divide by 120. The calculator does this reduction for any pair.
Which ratio for social media?
1:1 or 4:5 for feed posts, 9:16 for stories/reels, 16:9 for YouTube and link preview images.
How do I go from ratio to pixels?
Enter a target width: the matching height appears for your ratio and every preset.
Does this resize my image?
It computes dimensions; use the Image Resizer to apply them.