# 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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My back-of-the-envelope calculations suggest Amazon has risen 4,606 per cent since Barron's published its column, with an annualised average return of 21.1 per cent -- about quadruple what the S&P 500 returned over the same period.
My back-of-the-envelope calculations say that if he has been on a dual contract for five years then he will have earned a million pounds or so.
Back-of-the-envelope calculations place the yield between Rs150 billion to Rs200bn.
Independent of internal influences, pulls and pressures, the UNP second-line desirous of winning back the presidency after a quarter century gap, will be making back-of-the-envelope calculations, to determine individual aspirants for 'winnability'.
Yes, these are back-of-the-envelope calculations, but they point to an urgent question: Why isn't the US counting its hidden debts?
"We've seen a lot of back-of-the-envelope calculations, but we need more scientific discussion on where this network is headed.
Back-of-the-envelope calculations by security researchers show that cryptojacking can be lucrative AaAaAeA AE hackers targeting popular illic sites like The Pirate Bay can earn up to \$12,000 per month.
Unfortunately, Cessna doesn't publish sink rates at various speeds to compute that accurately, so we are left to back-of-the-envelope calculations. We know that at best-glide speed (65 knots), sink rate is 730 fpm and this requires 73 knots tailwind to reach the threshold.
Back-of-the-envelope calculations generally indicate that this will significantly increase profits.
However, back-of-the-envelope calculations would point towards a rise in costs for setting up new administrative buildings and additional staff, among others.
Using back-of-the-envelope calculations of how air and heat flow through structures, he argues that fires with those proportions produce the hottest flames for their volume of fuel.
"We started with ideas on a white board, then progressed to back-of-the-envelope calculations, spreadsheet tools, then finally transitioned to our standard design tools for CAD, aircraft performance, structural analysis, etc., making modifications all along the way for the unique aspects of our designs," explains Dr.
(The first genome took about 13 years.) Back-of-the-envelope calculations suggest that fast machines for DNA sequencing will be capable of producing 85 petabytes of data this year worldwide, twice that much in 2019, and so on.
Hence, based on earnings of \$93 million and a profit margin of 39 percent, my back-of-the-envelope calculations suggest industry revenue of \$238 billion.
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