Aspect Ratio Calculator
The Aspect Ratio Calculator simplifies any pixel width and height down to its cleanest ratio, like 16:9 or 4:3. It also solves a missing dimension when you know one side and want to keep the ratio intact - useful for cropping video, sizing social media graphics, or resizing images without distortion.
Frequently Asked Questions
Quick answers to common questions
Q:How do I find the aspect ratio of an image?
Enter the pixel width and height; the calculator simplifies them by their greatest common divisor. For example, 1920×1080 becomes 16:9.
Q:How do I keep the ratio when I change one dimension?
Tell the calculator the dimension you know and it solves the other to match the ratio — so a 720-pixel-wide video at 16:9 keeps the correct height automatically.
Q:What are the most common aspect ratios?
16:9 for widescreen video, 4:3 for classic monitors, 3:2 for many cameras, 1:1 for square posts, and 9:16 for phone-first vertical stories and reels.