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Back-of-the-envelope calculation
/bˈakɒvðɪˈɛnvəlˌəʊp kˌalkjʊlˈeɪʃən/
/bˈækʌvðɪˈɑːnvəlˌoʊp kˌælkjʊlˈeɪʃən/Back-of-the-envelope calculation
01
a rough estimate or calculation done quickly and informally, often using basic methods or assumptions
What is the origin of the idiom "back-of-the-envelope calculation" and when to use it?
The idiom "back-of-the-envelope calculation" originates from a common practice in which people perform quick calculations or estimations on the back of an envelope or a scrap of paper when they don't have access to a calculator or formal tools. This practice is often associated with simplicity, informality, and rough estimations. This idiomatic phrase is used to describe a rough, simplified, or quick estimation or calculation, typically done without using precise data or detailed analysis.
Example
Just give me a back-of-the-envelope calculation.
The engineer made a back-of-the-envelope calculation to determine the approximate load-bearing capacity of the bridge.
The manager used a back-of-the-envelope calculation to gauge the potential return on investment.
We did some back-of-the-envelope calculations to estimate the cost of the project.
Before making a final decision, they performed some back-of-the-envelope calculations to assess the financial feasibility.
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