Definition, Meaning & Synonyms

back-of-the-envelope

phrase

/ˌbæk əv ði ˈɛn.və.loʊp/

Definition

A rough calculation or an estimate made quickly, often done informally and without extensive data.

Examples

After reviewing the project, she made a back-of-the-envelope calculation to estimate the costs.
His back-of-the-envelope assessment indicated that they would be able to complete the task within a week.
Using a back-of-the-envelope method, we figured out how much we could save over the year.

Meaning

The term refers to the concept of making quick, approximate calculations or judgments in an informal manner, much like jotting down notes on the back of an envelope.