calculator

A mechanical or electronic device that performs mathematical calculations; (now usually) an electronic one specifically.

electronic calculator;   pocket calculator

The calculator on a bookkeeper's desk in the 1950s was an adding machine with mechanical guts.

A person who performs mathematical calculation.

During the war, his grandmother had worked at the Bletchley Park decoding station as a calculator.

First, many real-world investors bear little resemblance to the cool calculators of efficient-market theory: they're all too subject to herd behavior, to bouts of irrational exuberance and unwarranted panic.

A person who calculates (in the sense of scheming).

Near-synonyms: schemer, plotter; manipulator

He revealed himself to be a cold-blooded calculator out to sabotage his colleagues.

A set of mathematical tables.