I thought everyone was taught this: I was anyway (learned in 2000, JAR syllabus). Pretty amazed to think people are flying around without knowing how to do the performance calcs from the POH: is this really true?
I was taught it, and had to demonstrate weight & balance and performance calculations in front of the examiner during my skills test. I was under the impression that this was standard practice.
And doesn't the flight performance & planning exam cover it?