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Willhelm Schickard invented the "Calculating Clock", the first mechanical calculator.
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The first calculator was invented in 1623 but it is not known on which day it was made.
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The mechanical calculator was invented by the famous Blaise Pascal. It will perform all four arithmetic operations without relying on human intelligence. It could add and subtract two numbers directly and multiply and divide by repetition.
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Gottfried Leibniz developed the Stepped Reckoner using stepped gear wheels. It performed the 4 functions, but didn't work very well.
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Per Georg Scheutz built several difference engines from 1855 onwards, one of which was sold to the British government in 1859.
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Frank Baldwin invents the pin-wheel calculator in the US.
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Dorr E. Felt invents the Comptometer, the first key-driven calculating machine. In 1886 he joined with Robert Tarrant to form the Felt & Tarrant Manufacturing Company which went on to make thousands of Comptometers.
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The push-button calculator was develpoed by James L. Dalton in the United States. It was called the Dalton adding machine after James Dalton.
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The "Model K" (for "kitchen table"), which calculated using binary addition, was invented.It was a relay-based calculator that George Stibitz made.
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The complex Number calculator was invented by George Stibitz
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The Curta calculator was developed in 1948 and, although costly, became popular for its portability. This purely mechanical hand-held device could do addition, subtraction, multiplication and division
