On a rough calculation for The Economist by KPMG, getting out of London would be advantageous for high earners (see chart 2).

ECONOMIST: Britain��s financial industry

Our rough calculation says a large meteor impact on the same day as closest passage of the DA14 asteroid is really improbable.

CNN: A meteor and asteroid: 1 in 100 million odds

In a simplistic and very rough calculation, that comes to 200 more branches being sold off - or a chunk slightly larger than Lloyds TSB Scotland.

BBC: Banking on the future

My rough calculation of the chance that a single vote cast in New York will decide the presidency is 1 in 10 raised to the power 61, 000, or thereabouts.

FORBES: What Are the Odds That Your Vote Will Count?

Doctors still use a rough calculation to work out the chances of survival - if the percentage of the body burned added to the age of patient exceeds 100, then things are looking bad.

BBC: Saving your skin

But I do believe that when the initial estimates came that there were -- it was 5, 000 barrels spilling into the ocean per day, that was based on satellite imagery and satellite data that would give a rough calculation.

WHITEHOUSE: Deepwater BP Oil Spill: Presidential Press Conference

One consequence of Indian Railways' present bias, according to a rough calculation by the World Bank, is that freight tariffs could be reduced by more than 40% if its social burdens were paid directly by the user or the government.

ECONOMIST: Indian railways: There's no such thing as a free ride | The

Crews do a rough calculation.

BBC: Ambulances 'fiddling response figures'

Yes, I agree, very rough and ready calculation.

FORBES: Occupy London: Falling at the First Step for GDP != Turnover

The calculation is rough and ready, and I come to slightly lower numbers than Allwood and co, but the point is that this measurement uses a unit we're familiar with - us.

BBC: Go Figure: Why does every person need 200kg of steel a year?