html - How to convert <font size="10"> to px?

Question

I need to convert <font size="10"> to px.

Example only(not correct): <font size="10"> is equivalent to 12px.

Is there any formula or table conversion out there to convert <font size="10"> to px?

Answer 1

<font size=1>- font size 1</font><br>
<span style="font-size:0.63em">- font size: 0.63em</span><br>

<font size=2>- font size 2</font><br>
<span style="font-size: 0.82em">- font size: 0.82em</span><br>

<font size=3>- font size 3</font><br>
<span style="font-size: 1.0em">- font size: 1.0em</span><br>

<font size=4>- font size 4</font><br>
<span style="font-size: 1.13em">- font size: 1.13em</span><br>

<font size=5>- font size 5</font><br>
<span style="font-size: 1.5em">- font size: 1.5em</span><br>

<font size=6>- font size 6</font><br>
<span style="font-size: 2em">- font size: 2em</span><br>

<font size=7>- font size 7</font><br>
<span style="font-size: 3em">- font size: 3em</span><br>