English Dictionary

ready reckoner

noun

(historical) A printed book or table containing precalculated values, often multiples of given amounts. / A computer program which calculates values; an online calculator.

I always keep a ready reckoner in my bag.

意味（1）

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

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[…]

意味（2）

A computer program which calculates values; an online calculator.