How to convert from hanyu pinyin to IPA?
Personally I think the IPA given in the Wikipedia page for Pinyin is organized well and the symbols don't change like other pages I've seen, i.e.  the browser changes to other symbols ruining the IPA scheme.

Like it has been said, the IPA transcription might change in some words endings when you transcribe real speech, so you must be aware of that and know what the different symbols mean.