Calculator

wiktionary

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In the sense of a person, from Middle English calkelatour(“mathematician, astrologer”), borrowed from Latin calculātor, equivalent to calculate +‎ -or. The other meanings arose in Modern English.

etymonline

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calculator (n.)

late 14c., "mathematician, one who calculates," from Latin calculator, from calculatus, past participle of calculare "to reckon, compute," from calculus "reckoning, account" (see calculus). Of mechanical adding machine contraptions, from 1784. Of electronic ones, from 1946.

Electronic calculator uses 18,000 tubes to solve complex problems [Scientific American headline, June 1946]