For normal calculations, one uses a calculator.
For wind drift calcs, you can also use a calculator (with sin/cos functions), but there are few if any of such questions in the exams now.
As I said, there may be some such questions in the CPL, which is a purely VFR dead reckoning exercise, and I don't know if they allow calculators in there.
I've now done all the IR exams (ATPL subset) which might have contained wind drift calcs, and did not see any such questions. The FTO study material (GTS) was full of them, however, but that is another story..........