Definition:
A "ready reckoner" is a noun that refers to a handy book or guide that contains tables or charts to help people quickly calculate or find information. It simplifies complex calculations and makes it easier to get answers without doing all the math yourself.
In more advanced settings, a ready reckoner can be used in various professional fields. For instance, architects might use a ready reckoner for calculating material quantities, while engineers might use it for load calculations.
While "ready reckoner" primarily refers to a calculation aid, in some contexts, it could also refer to any quick reference tool or guide that helps in making decisions or finding information.
While there are no direct idioms or phrasal verbs that specifically include "ready reckoner," the concept of "quick reference" is often used in idiomatic expressions.
A ready reckoner is a useful tool for anyone needing to perform fast calculations or find quick information without going through lengthy processes.