back-of-the-envelope
idiomPart ofenvelope
back-of-the-envelope — idiom
1. Describing a calculation, estimate, or plan that is done quickly and roughly, wi
1.idiom
Definition
Describing a calculation, estimate, or plan that is done quickly and roughly, without detailed analysis or precise data.
Example
We did a back-of-the-envelope estimate and found the project would cost around fifty thousand dollars.
A back-of-the-envelope calculation suggested the trip would take about three hours by car.