Calculators
FREE CALCULATORS
Interest rate calculators here.
Simple, basic calculator here.
BMI body fat calculator here.
Hourly or yearly income wage calculator here.
Calculate Calorie Needs for your weight group here.
History of the Calculator Origin: the abacus
The first calculators were abacuses, and were often constructed as a wooden frame with beads sliding on wires. Abacuses were in use centuries before the adoption of the written Arabic numerals system and are still used by some merchants, fishermen and clerks in China and elsewhere.
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- A type of abacus calculator
1900s to 1960s Mechanical calculators, photo on right 1914, reach their zenith.
The first half of the 20th century saw the gradual development of the mechanical calculator mechanisms that had already been invented, though there were some significant innovations.
The Dalton adding-listing machine introduced in 1902 was the first of its type to use only ten keys, and became the first of many different models of “10-key add-listers” manufactured by many companies.
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