The phrase "according to a calculation" is correct and usable in written English.
It can be used when referencing a specific calculation or numerical analysis that has been performed to derive a conclusion or result.
Example: "According to a calculation, the project's total cost will exceed the initial budget by 20%."
Alternatives: "based on a calculation" or "as per a calculation".
Icahn's stake in the refineries has lost about $1.7 billion in value, according to a calculation by The Post.
His club is now the world's ninth-ranked owner, according to a calculation by the website Thoroughbred Racing Commentary.
Population geneticists believe that the ancestral human population was very small -- a mere 2,000 breeding individuals, according to a calculation published last December.
Schultz would personally pay an additional $91 million in taxes under Warren's wealth tax, according to a calculation based on Forbes' ranking of the richest Americans.
In the worst case, the waiting time would be 300,000 generations, according to a calculation by Jonathan Pritchard, a population geneticist at the University of Chicago.
According to a calculation example of the whole process, it is proved that the SGVF process has potential in seawater desalination.
New-home prices fell 0.7 percent, according to a Reuters calculation using data published by the National Bureau of Statistics.
Collectively, they have more money than a third of American households combined, according to a Quartz calculation.
In Hong Kong, gasoline costs more here than anywhere else in the world -- $5 a gallon -- according to a World Bank calculation that excluded temporary price gouging in war areas.
The 500 richest people in the world, according to a U.N. calculation a few years ago, earned more than the 416 million poorest people.
According to a National Weather Service calculation of data from one 27-year period, the airport received about 11percentt more rain than the downtown spot.
