Calculate aspect ratios, resize dimensions while maintaining proportions. Common presets for video, photo, mobile screens, and social media
Lock an aspect ratio and calculate the missing dimension. Enter a width and ratio (like 16:9) to find the height, or enter both dimensions to determine the ratio. Useful for resizing images, videos, and design layouts without distortion.
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A 1920×1080 hero image must be resized to 1280 wide without distorting it, what height keeps the ratio?
Input
1920 × 1080 → new width 1280
Result
Aspect ratio 16:9 · new size 1280 × 720
The ratio simplifies to 16:9, so locking width to 1280 forces height to 720 to avoid stretching. The tool solves for the missing dimension and names the simplified ratio, which is handy for picking standard video and screen sizes.
Lock an aspect ratio and calculate the missing dimension. Enter a width and ratio (like 16:9) to find the height, or enter both dimensions to determine the ratio. Useful for resizing images, videos, and design layouts without distortion.
Find the right height when scaling a photo to a new width while preserving proportions.
Calculate frame dimensions for standard and ultrawide aspect ratios.
That is 16:9, the standard widescreen ratio used by most monitors and TVs.
Yes. Type any two numbers separated by a colon, such as 3:2 or 2.35:1.
Every calculation runs locally in your browser. Your numbers and expressions are not transmitted or stored.