Ready reckoner

noun

Definitions

Noun
  1. 1
    A printed book or table containing precalculated values, often multiples of given amounts. historical

    "Nor did he trouble his borrowers with abstract calculations of figures, or references to ready-reckoners; his simple rule of interest being all comprised in the one golden sentence, ‘two-pence for every half-penny,’ which greatly simplified the accounts[…]"

  2. 2
    a handbook of tables used to facilitate computation wordnet
  3. 3
    A computer program which calculates values; an online calculator.

Etymology

Coined by English grammarian and textbook writer Daniel Fenning in 1757.

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