# How to set up page layout "by hand"

So you're eager to do it yourself, notwithstanding the cautions outlined in “changing margins”.

It's important that you first start by familiarising yourself with LaTeX's page layout parameters. For example, see section C.5.3 of the LaTeX manual (pp. 181-182), or corresponding sections in many of the other good LaTeX manuals (see LaTeX books).

LaTeX controls the page layout with a number of parameters, which allow you to change the distance from the edges of a page to the left and top edges of your typeset text, the width and height of the text, and the placement of other text on the page. However, they are somewhat complex, and it is easy to get their interrelationships wrong when redefining the page layout. The layout package defines a `\layout` command which draws a diagram of your existing page layout, with the dimensions (but not their interrelationships) shown.

Even changing the text height and width, `\textheight` and `\textwidth`, requires more care than you might expect: the height should be set to fit a whole number of text lines (in terms of multiples of `\baselinskip`), and the width should be constrained by the number of characters per line, as mentioned in “changing margins”.

Margins are controlled by two parameters: `\oddsidemargin` and `\evensidemargin`, whose names come from the convention that odd-numbered pages appear on the right-hand side (“recto”) of a two-page spread and even-numbered pages on the left-hand side (“verso”). Both parameters actually refer to the left-hand margin of the relevant pages; in each case the right-hand margin is specified by implication, from the value of `\textwidth` and the width of the paper. (In a one-sided document, which is the default in many classes, including the standard article and report classes, `\oddsidemargin` stands for both.)

The “origin” (the zero position) on the page is one inch from the top of the paper and one inch from the left side; positive horizontal measurements extend right across the page, and positive vertical measurements extend down the page. Thus, the parameters `\evensidemargin`, `\oddsidemargin` and `\topmargin`, should be set to be 1 inch less than the true margin; for margins closer to the left and top edges of the page than 1 inch, the margin parameters must be set to negative values.

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