TopToolsAiCalculate the simplified aspect ratio of any width and height in pixels, and see if it matches a common ratio like 16:9 or 9:16 used for video and social media. An image sized 1920 by 1080 pixels simplifies down to the familiar 16:9 ratio, while 1080 by 1350 simplifies to 4:5, the portrait ratio Instagram recommends for feed posts.
Last updated: 1 Sep 2026
How to use Aspect Ratio Calculator
- Enter a width and height in pixels.
- Click "Calculate" to see the simplified aspect ratio (e.g. 1920x1080 → 16:9).
Frequently asked questions
Why do I need to know aspect ratio?
It ensures images and videos display correctly without stretching or cropping — important when resizing for platforms like YouTube, Instagram or presentations.
What if my ratio doesn't match a common one?
That's fine — many custom images and designs use non-standard ratios; the calculator just simplifies whatever numbers you enter.
What are common aspect ratios I should know?
16:9 is standard widescreen video, 4:3 is older TV/presentations, 1:1 is square (Instagram), and 9:16 is vertical/mobile video.
How is the simplified ratio calculated?
It divides both numbers by their greatest common divisor — e.g. 1920×1080 both divide evenly by 120, giving the simplified 16:9.
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