The dream, in which you see the calculator, denotes to the problems that need to be thought twice. Perhaps there is a very important issue in your life, where you cannot make any mistakes. The dream suggests you to get planned things and look forward in the future of what you could achieve. The calculator could also reflect the state of your waking life where you have to calculate and work with numbers a lot.
Read more about dreaming of Calculator in other dream meanings interpretations.