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Welcome to the CPL Meteorology question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.
bobtait replied the topic: How do we calculate cloud base?
I'm not sure exactly what you want with this question. The pilot never needs to 'calculate' the cloud base, the Met man does that. If you mean how is the cloud base expressed, it depends on the forecast you're reading. A Graphical Area Forecast gives cloud base above sea-level and an aerodrome forecast (TAF) or (TTF), gives cloud base above ground level.