16:9 aspect ratio with fixed width

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If I were to embed a YouTube video for example
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                <span>2021-01-11 21:17</span>
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<p>The best way is to simply use CSS because u can keep<br>
it responsive as the page loads and not have a visible<br>
'jump' in the iframe width and height. </p>

<p>Also, you don't have to set a fixed width (although u can)</p>

<p><strong>like this:</strong>  </p>

<pre><code>iframe {width: 100%; height: calc(~'100% * 9/16');}
</code></pre>
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                <span>2021-01-11 21:21</span>
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<pre><code>$('.player').parent().attr('width', 560*9/16)
</code></pre>
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                <span>2021-01-11 21:24</span>
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<p>Aspect ratio is just width:height. So if you wanted to calculate the height based on a known width it is pretty straightforward.</p>

<pre><code>//width=560, wanted height is 315
$('.player').parent().attr('height', 560*9/16);
</code></pre>
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                <span>2021-01-11 21:25</span>
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<p>Pretty old question but if somebody still seeking for the answer, this one could be a better approach. </p>

<pre>

    function getRelativeWidth(ratio, crntHght) {
        ratio = ratio.split(":");
        var wdthRto = ratio[0];
        var hghtRto = ratio[1];
        return ((wdthRto*crntHght) / hghtRto); 
    }

    function getRelativeHeight(ratio, crntWdth) {
        ratio = ratio.split(":");
        var wdthRto = ratio[0];
        var hghtRto = ratio[1];
        return ((crntWdth*hghtRto) / wdthRto); 
    }
    var wdth = 1600;
    var hght = 900;
    var getHeight = getRelativeHeight("16:9", wdth); 
    var getWeight = getRelativeWidth("16:9", hght); 

    console.log(getHeight);
    console.log(getWeight);

</pre>
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                <span>2021-01-11 21:27</span>
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<p>I would recommend using css calc instead of jQuery for this:</p>

<pre><code>width: 560px;
height: calc(560px * 9/16);
</code></pre>
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