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5.5 Page layout parameters

\headheight
Height of the box that contains the running head. Default is ‘30pt’, except in the book class, where it varies with the type size.
\headsep
Vertical distance between the bottom of the header line and the top of the main text. Default is ‘25pt’, except in the book class, where it varies with the type size.
\footskip
Distance from the baseline of the last line of text to the baseline of the page footer. Default is ‘30pt’, except in the book class, where it varies with the type size.
\linewidth
Width of the current line; the default varies with the font size, paper width, two-column mode, etc. For an article document in ‘10pt’, it's set to ‘345pt’; in two-column mode, that becomes ‘229.5pt’.
\textheight
The normal vertical height of the page body; the default varies with the font size, document class, etc. For an article or report document in ‘10pt’, it's set to ‘43\baselineskip’; for book, it's ‘41\baselineskip’. For ‘11pt’, it's ‘38\baselineskip’ and for ‘12pt’, ‘36\baselineskip’.
\textwidth
The normal horizontal width of the page body; the default varies as usual. For an article or report document, it's ‘345pt’ at ‘10pt’, ‘360pt’ at ‘11pt’, and ‘390pt’ at ‘12pt’. For a book document, it's ‘4.5in’ at ‘10pt’, and ‘5in’ at ‘11pt’ or ‘12pt’.
\topmargin
Space between the top of the TeX page (one inch from the top of the paper, by default) and the top of the header. The default is computed based on many other parameters: \paperheight − 2in − \headheight − \headsep − \textheight − \footskip, and then divided by two.
\topskip
Minimum distance between the top of the page body and the baseline of the first line of text. For the standard clases, the default is the same as the font size, e.g., ‘10pt’ at ‘10pt’.