DESC
Enter any width and height and the tool simplifies them to the classic aspect ratio (like 16:9) using the greatest common divisor. You can also pick a target ratio and one known side to find the missing dimension — perfect for resizing videos, images or screens without distortion.
Aspect ratio is shape expressed as numbers — width ÷ height. Once you see them, they are everywhere:
The calculator's daily job: scaling without distortion. To fit 16:9 content into a 4:5 slot, you compute the matching height (or width) and crop the overflow — that is what every smart thumbnail does. For the full table of exact pixel sizes per platform, see our social media sizes guide.
Everything runs entirely in your browser. Nothing you type is ever sent to any server or stored.
Divide both width and height by their greatest common divisor. For example, 1920 divided by 120 is 16 and 1080 divided by 120 is 9, giving 16:9.
It means that for every 16 units of width there are 9 units of height. It is the standard for HD and Full HD video.
1920x1080 simplifies to 16:9, the most common widescreen format.
Keep the same ratio: if your target is 16:9 and you know the width, the height is width times 9 divided by 16.
Yes — 9:16 is included as a preset, ideal for reels, shorts and stories.
Yes, completely free with no account.