pocket calculator

A calculator is a machine designed for performing arithmetic operations and mathematical functions. Its origins trace back to Blaise Pascal's 1642 invention, with further advancements by Gottfried Wilhelm Leibniz in the 17th century. Early 20th-century inventors developed smaller, more user-friendly calculating devices, some powered by electric motors.1

The advent of electronic data processing in the mid-1950s signaled a shift away from mechanical calculators. The development of miniature solid-state electronic devices led to the creation of pocket-sized calculators. By the late 20th century, these electronic calculators could perform basic arithmetic, trigonometric functions, and even store data and instructions, offering programming capabilities similar to small computers. They operated significantly faster than their mechanical predecessors. A pocket calculator is specifically defined as a calculator small enough to fit in a shirt pocket.12