# Difference between LaTeX and Word in setting font size

I am working in LyX (compiled with MiKTeX) on Windows. I am a newbie so I am wondering how can I manually set the font (like entering in a number as you would in Microsoft Word).

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I rephrased your title, thinking that this might be more appropriate. Change it if needed. –  Werner Jan 5 '12 at 2:55

Font selection in TeX is a little different from that of MS Word. In LyX, the following choices are available:

• Changing the default font size of the document: Under Document>Settings...>Fonts, you can choose the Base Size as being Default, 10pt, 11pt or 12pt (Default is 10pt in most cases). This is similar to the traditional \documentclass[<fontsize>]{<doc-class>} selection in LaTeX.

• For changing font size "on the fly" within the text: Select the text, click the Text Style button (or Edit>Text Style>Customized...) and choose one of the Size options (Small, Normal, Large, etc.). Click OK or Apply to activate the font selection.

Under the Base Size of 10pt / 11pt / 12pt (respectively), the following font sizes (or Text Styles) hold:

• Tiny (LaTeX's \tiny): 5pt / 6pt / 6pt
• Smallest (LaTeX's \scriptsize): 7pt / 8pt / 8pt
• Smaller (LaTeX's \footnotesize): 8pt / 9pt / 10pt
• Small (LaTeX's \small): 9pt / 10pt / 10.95pt
• Normal (LaTeX's \normalsize): 10pt / 10.95pt / 12pt
• Large (LaTeX's \large): 12pt / 12pt / 14.4pt
• Larger (LaTeX's \Large): 14.4pt / 14.4pt / 17.28pt
• Largest (LaTeX's \LARGE): 17.28pt, 17.28pt / 20.74pt
• Huge (LaTeX's \huge): 20.74pt / 20.74pt / 24.88pt
• Huger (LaTeX's \Huge): 24.88pt / 24.88pt / 24.88pt
• Increase: Step one font size up
• Decrease: Step one font size down
• Reset: Same as Normal

For specifying and using other font sizes, you will have to include packages that support this or add LaTeX code within your document where you want these changes to take effect. For example, the best way to accomplish this is to use Latin Modern via the lmodern package. Insert this in your LaTeX Preamble using

and then insert the LaTeX code (via Ctrl+L or ) \fontsize{40pt}{48pt}\selectfont where you want it to take effect. \fontsize{<size>}{<baselineskip>} sets the font size to <size> and the skip from baseline-to-baseline as <baseline>. it is usually accepted to have <baseline>~1.2x<size>.Note that this command is considered a switch, making all subsequent text that size. If you want to localize the change, you need to use grouping via braces {...}. For example, the LyX input

yields

A similar approach can be followed using the anyfontsize package.

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I didn't understand why you put three sizes on each predefined font sizes: Smaller (LaTeX's \footnotesize): 8pt / 9pt / 10pt If I chose Smaller, what size I'm choosing? –  user1367593 Jun 9 '13 at 17:07
If your document uses a base size of 10pt, then Smaller chooses a size of 8pt. If your document uses a base size of 11pt, then Smaller chooses a size of 9pt. If your document uses a base size of 12pt, then Smaller chooses a size of 10pt. –  in_wolfram_we_trust Jun 10 '13 at 7:18
@user1367593: See in_wolfram_we_trust's comment. It depends on you base document font size. –  Werner Jun 10 '13 at 14:11