Without devolving into a massive rant knowing how to calculate this is relatively straight forward and there are some good apps that can do it for you, rather than doing the math itself. It is also one of the weaknesses of the automated ecg interpretations. However it is also of great clinical importance i.e.. sudden cardiac death and has been a previous question.
Hopefully the following is not new to you:
I don't think I can do a better job of explaining than the following: http://lifeinthefastlane.com/ecg-library/basics/qt_interval/
If that doesn't clear things up the only thing I can suggest is to work it out every time and ecg is thrust under your nose - if you work anywhere like where I do this will mean after one shift you will be an expert!
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