If you mean electronically, then it would still be called a calculator. But, before that, people used the abacus, which had lots of sliding thingies and such.
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who invented the first mechanical digital calculator
The Chinese invention that was the first calculator was called an abacus. It was invented sometime between 2700 and 2300 BC.
The first calculator dates back to 2700 BC with the invention of the Abacus, invented in Mesopotamia.In the 1940's and 1950's, the first mainframe computers were invented, which led towards the hand-held calculators we know today.In the mid-1960's, desktop calculators were coming to fruition, and in 1970, the first "Pocket" calculator was invented in Japan by Sanyo, called the ICC 0081.
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The very first calculator ever used could be an abicus, an electronic calculator, or even your brain. The first calculator invented was the abacus.