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I've been googling for some time now, and can't find the manual for the TikZ library calc. All I see is people using it. Where can I find the manual or some info?

Is it the same as the LaTeX package calc? The latter doesn't seem to mention TikZ in the manual.

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No not the same. The LaTeX one is included with \usepackage{calc}. You need to use \usetikzlibrary{calc} to do coordinate computations in TikZ, but I don't recall seeing a separate doc for it. See the TikZ-PGF manual for examples. – Peter Grill Mar 7 '12 at 22:34

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It is part of the manual for PGF/TikZ: Section 13.5 Coordinate Calculations. And no, it is not the same as the calc package.

The documentation is usually included with your TeX distribution, and you can access it manual by typing texdoc pgf in a command prompt/terminal and hitting enter (saves you from having to download it from CTAN). This works for any package, and you'll get the documentation matching the version of the package you have installed.

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