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Calculate image dimensions and aspect ratios for responsive design and video.
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<iframe src="https://tools.infiniolabs.com/converter/aspect-ratio?embed=1" width="100%" height="600" frameborder="0" allowtransparency="true" loading="lazy" title="aspect-ratio"></iframe> <p><a href="https://tools.infiniolabs.com/converter/aspect-ratio" target="_blank" rel="noopener">Powered by Infinio Tools</a></p>
aspect-ratio: 16 / 9; padding-bottom: 56.25%; /* fallback */