ready reckoner

American

noun

reckoner.

ready reckoner British

noun

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of ready reckoner

First recorded in 1750–60

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

It looks like a page out of a ready reckoner or a mathematician's nightmare.

From The Lost Valley by Walsh, James Morgan

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)

Fritz was the ready reckoner of the three, and quickly answered, "Twelve hundred horses, six hundred wagons, and six hundred drivers."

From Pixy's Holiday Journey by Lang, George

Thomas system ready reckoner 500 cribbage. © on text & other copyrightable elements; 13Jan34; AA141617.

From U.S. Copyright Renewals, 1961 July - December by Library of Congress. Copyright Office

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023