Back-of-the-envelope Definition

adjective

(idiomatic) Approximate, rough, simplified, especially of a calculation, estimation or other reasoning.

Do some back-of-the-envelope calculations before all the facts come in.
Wiktionary

Origin of Back-of-the-envelope

  • From the idea that the calculation or reasoning would be jotted down on any available scrap of paper such as the actual back of an envelope.

    From Wiktionary

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