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reckoner

9.0

A book of tables that helps you calculate and convert numbers

noun
/ˈrɛkənər/

Archaic

: calculadora

My grandfather had a well-worn reckoner he used for financial estimates.

Examples

The engineer referred to a reckoner to convert inches to millimeters quickly.
Before calculators, people often used a reckoner for complex arithmetic.
The reckoner helped me with my math homework.
I need a reliable reckoner for my calculations.
The reckoner provided accurate multiplication and division tables for students.
She used the reckoner to check her work on the complex math problems.
The old reckoner contained numerous formulas for converting measurements.

Synonyms

ready reckoner

vsreckoner

8.1

A small book with tables to do quick price and weight calculations

is a broader handbook for calculations and conversions beyond quick price tables

nomogram

vsreckoner

Specialized

9.9

A chart that shows how numbers relate so you can read values

is a text or table based handbook rather than a graphical tool

minicalculator

vsreckoner

Archaic

8.3

A very small handheld electronic device for doing simple math

is a printed set of tables for calculation instead of an electronic device

Compounds

ready reckoner

8.1

A small book with tables to do quick price and weight calculations

How Useful

handbook

56 3.1

reckoner

Archaic

9.0

table

Specialized

779 2.6

chart

420 1.3

Surface Forms

reckoner singular

reckoners plural

Morphology

reckoner = reckon (semi-transparent) = reckon + er

Formed from 'reckon' + '-er' but extended to mean an instrument or handbook for calculating, so the exact object meaning is an extension of the agentive pattern.

Etymology

Reckoner can also mean a book of tables used for calculating, and it comes from reckon 'to count'. A reckoner in this sense is like a 'calculator in book form' that people used before machines.