ready reckoner

American  

noun

1. reckoner.

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ready reckoner British  

noun

1. a table of numbers used to facilitate simple calculations, esp one for applying rates of discount, interest, charging, etc, to different sums

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Etymology

Origin of ready reckoner

First recorded in 1750–60

Example Sentences

Alongside a new "ready reckoner" tool, allowing farms to calculate how much they might be offered, Irranca-Davies announced £33m for nine preparatory schemes to " back farm businesses during the transition to the new SFS".

From BBC • Jul. 20, 2025

This story may serve to show how nature supplies man with a ready reckoner in his faculty of perception, which suffices well enough for the affairs of the simpler sort of life.

From Anthropology by Marett, R. R. (Robert Ranulph)

You’ve a good business, Mr. Macartney, so I dare say you’re a ready reckoner.

From We and the World, Part II A Book for Boys by Ewing, Juliana Horatia Gatty

A few feet away, his father was carefully calculating, with the aid of a ready reckoner, the compound interest on a little pile of bills of exchange which lay before him.

From The New Tenant by Oppenheim, E. Phillips (Edward Phillips)

Also she was somethin' of a ready reckoner.

From Side-stepping with Shorty by Ford, Sewell