back-of-the-envelope


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back-of-the-envelope

Describing something, usually a calculation, that is approximated in a quick, informal, and rough manner, as might be sketched out on a scrap of paper (such as the back of an envelope). When it came time to pay the bill, we had to do some back-of-the-envelope calculations to figure out who owed how much. These are just some back-of-the-envelope figures, but it looks like we should have enough money to pay for the renovation.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
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