The difference between Calculator and Ready reckoner
When used as nouns, calculator means a mechanical or electronic device that performs mathematical calculations, whereas ready reckoner means a printed book or table containing precalculated values, often multiples of given amounts.
check bellow for the other definitions of Calculator and Ready reckoner
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Calculator as a noun:
A mechanical or electronic device that performs mathematical calculations.
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Calculator as a noun (dated):
A person who performs mathematical calculation
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Calculator as a noun:
A person who calculates (in the sense of scheming).
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Calculator as a noun (obsolete):
A set of mathematical tables.
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Ready reckoner as a noun:
A printed book or table containing precalculated values, often multiples of given amounts.
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Ready reckoner as a noun:
A computer program which calculates values; an online calculator.