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When changing a file with the class

\documentclass[a4paper,12pt]{extbook}

to

\documentclass[a4paper,10pt]{extbook}

I noticed that \normalsize parts are only about 9% smaller than before, while I expected 20%. The length of sentences also decreases only by 9%. I use the standard CM fonts. This appears to contradict the actual font sizes listed at http://en.wikibooks.org/wiki/LaTeX/Fonts#Sizing_text Can anyone please enlighten me as what is going on?

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  • 2
    Hi! Do you mean smaller in height or in width?
    – yo'
    Aug 12, 2014 at 19:02
  • 3
    I get 6.83331pt for the height of an ‘A’ at 10pt, and 8.2pt at 12pt size. The ratio is 1.2. The ratio of the widths is 1.17; not 1.2, because Computer Modern fonts are not geometrically scaled.
    – egreg
    Aug 12, 2014 at 19:44
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    You should expect 17% smaller, because 10/12 ≈ 0.83; can you tell how you get 9%?
    – egreg
    Aug 12, 2014 at 20:19
  • You should expect 15% smaller based on the sizes given on the page you linked to since the ratio of the 10pt to 12pt size given there for \normalsize is .85.
    – cfr
    Aug 12, 2014 at 22:10

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