back-of-the-envelope calculation

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back-of-the-envelope calculation

A calculation or mathematical formulation 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.
References in classic literature ?
"I wrote 'em on the back of the envelope of my aunt's last letter," he said, and pulled it from between the pages of Sappho.
Mr Hinde urged people to post their votes by Tuesday, May 1, and to follow the instructions about signing the back of the envelope and putting their date of birth.
Residential will remain cool as mortgagors continue to carefully evaluate their financial positions, putting away old "back of the envelope" calculations which got them where they are.
automakers look to improve the safety, capabilities, and differentiation of the models in their lineup, their interest increases." To which Badawy adds: "You can't base your future on 'back of the envelope' calculations anymore.
The only other copy is the Boston return address on the back of the envelope.
Make sure the address on the back of the envelope shows through the window.
Placing these labels on the front and back of the envelope and including the required postage will get you the two- to three-day delivery you desire.
Mr Hinde urged people to help by posting their votes by Tuesday at the latest, and by clearly following the instructions about signing the back of the envelope and putting their date of birth.