Recovering default margin behaviour using `geometry`

Question

I am wondering, for a document from class article with the following setup:

\documentclass[a4paper,11pt,oneside]{article}

What values should one input into fields top, right, bottom and left (in inches or points) from package geometry to recover the default margin behaviour from the document?

\usepackage[top=¿?, bottom=¿?, left=¿?, right=¿?]{geometry}

I have found the following thread but it does not seem to answer my question: Default margins for geometry package.

Auxiliary, how is can this default behaviour be checked? In particular, if I change the document type or the font size, the default behaviour might no longer be the same.

Answer 1

The geometry package has a pass option which will prevent it from changing the paper size or margins set by the document class.

\usepackage[pass]{geometry}

Answer 2

Use the layouts package. For example

\documentclass[12pt]{article}
\usepackage{layouts}
\begin{document}
\begin{figure}
\currentpage
\oddpagelayouttrue
\pagedesign
\caption{Odd page layout for this document}
\end{figure}
\end{document}

will produce a diagram of the page layout and list the values of all the layout parameters.

The package provides many other facilities, such as drawing a proposed page layout.