Aspect Ratio Calculator
Simplify aspect ratios and solve missing dimensions.
Aspect ratio
16 : 9
Decimal ratio
1.7778
Orientation
Landscape
Height at 1280 wide
720 px
The shape, reduced
Divide width and height by their greatest common factor: 1920×1080 reduces to 16:9, the video standard; photos lean 3:2 and 4:3; phones film 9:16 vertical. Resizing must scale both sides by one factor or the image distorts.
Solving the missing side
New height = new width × (original height ÷ width). Cropping between ratios (16:9 video to 1:1 social) inevitably discards pixels — plan framing for the tightest target crop, a rule broadcasters call 'shoot and protect.'
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