how many pixels is h1 text html code example

Example: how many pixels is h1 text html

h1 is   32px   (2em)
h2 is   24px (1.5em)
h3 is 20.8px (1.3em)
h4 is   16px   (1em)
h5 is 12.8px (0.8em)
h6 is 11.2px (0.7em)