Szia!
Szerintem az alábbi jó lesz.
sudo apt-get galculator
Info: http://galculator.sourceforge.net/
"galculator is a scientific calculator. It supports different number
bases (DEC/HEX/OCT/BIN) and angles bases (DEG/RAD/GRAD) and features
a wide range of mathematical (basic arithmetic operations, trigonometric
functions, etc) and other useful functions (memory, etc) at the moment."