Calculator Day

What Is Calculator Day?

Every March 20th is "Calculator Day" (電卓の日, Dentaku no Hi) in Japan. The date commemorates the world's first compact electronic desktop calculator — the "Casio 001" — introduced by Casio Computer Co., Ltd. in 1964 as Japan's first transistorized calculator and one of the world's first practical electronic desk calculators. Calculator Day was established in 1974 by the Japan Business Machine and Information System Industries Association (一般社団法人ビジネス機械・情報システム産業協会) to mark this achievement and to promote awareness of Japan's extraordinary contributions to the development of computing devices.

Japan's Calculator Revolution

The development of the electronic calculator in the early 1960s was one of Japan's most significant technological achievements of the postwar era. Casio, Sharp (then Hayakawa Electric), Canon, and other Japanese electronics companies competed intensely to produce smaller, faster, and cheaper electronic calculators — driving one of the most dramatic cycles of technological improvement and price reduction in consumer electronics history. Japanese engineers reduced the price of a basic electronic calculator from hundreds of thousands of yen in the early 1960s to a few thousand yen by the mid-1970s — a price reduction of over 99% in a single decade.

The Calculator and Japanese Technology Leadership

Japan's calculator industry was a proving ground for technologies — integrated circuits, LCD displays, solar cells — that were subsequently applied across the broader electronics industry. Casio's invention of the first electronic calculator with a plastic resin body (1964), Sharp's development of the first all-transistor calculator (1964), and subsequent innovations in display technology, power consumption, and miniaturization all contributed to Japan's leadership in electronics manufacturing that would culminate in the dominance of Japanese consumer electronics in the 1970s and 1980s.

Fun Facts

• The "calculator wars": The competition among Japanese calculator manufacturers in the late 1960s and 1970s was so intense that it was described as "calculator wars" (電卓戦争, dentaku sensō) — with manufacturers releasing multiple new models each year in races to achieve the smallest size, longest battery life, or lowest price.
• Casio's first product: Casio's first ever product, before the calculator, was a cigarette holder with a ring attached — invented by company founder Toshio Kashio to allow smokers to enjoy a cigarette down to the butt without burning their fingers, reflecting Casio's founding spirit of creative problem-solving.