When did handheld calculators become popular?

The early 1970s, after integrated circuits made them small and affordable. The HP-35 and TI calculators replaced slide rules in classrooms within a decade.

A Brief History of Calculators

Ancient counting tools

Before electronics, humans relied on the abacus, counting boards, and Napier's bones to speed up arithmetic. These devices made trade, taxation, and astronomy possible at scale.

Mechanical calculators

Blaise Pascal's Pascaline (1642) and Leibniz's stepped reckoner introduced gears and dials that could add, subtract, and multiply. Comptometers and curta calculators dominated offices well into the 20th century.

The electronic era

The 1960s and 70s brought desktop electronic calculators, then handheld units from HP and Texas Instruments. The HP-35 (1972) was the first handheld scientific — replacing the slide rule almost overnight.

Software and the web

Today, most calculations happen inside spreadsheets, mobile apps, and websites. Browser-based calculators like My Calculator Monkey run instantly with no install, no signup, and no data leaving your device.

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