Image Tools
Aspect Ratio Calculator
Find an image's aspect ratio and calculate matching dimensions for any resize.
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Fill either the new width or new height — the other side is calculated to keep the ratio.
About this tool
Resizing without distortion means keeping the aspect ratio. Enter the original width and height to see the simplified ratio (1920×1080 → 16:9), then type your new width or height and the matching other dimension is calculated instantly.
Essential for video frames, responsive images, print scaling and CSS containers.
How to use
- Enter the original width and height.
- Enter the new width (or height).
- Read the matching dimension and the simplified ratio.
Frequently asked questions
The standard widescreen ratio — 1920×1080, 1280×720 and 3840×2160 are all 16:9.
Both sides are divided by their greatest common divisor: 1920 and 1080 share 120, giving 16:9.
Square posts are 1:1, portrait 4:5, stories and reels 9:16.