"To calculate this number" means to perform a specific mathematical operation or equation in order to determine the value of the given number. Full definition
Specifically, we are referring to the art (and science) of calculating the number of calories, which plays into how much to feed a dog each meal. (petspotential.com)
There is no mathematical basis for calculating this number. (filkowlaw.com)
By calculating the numbers, you'll see that investing at a return of 4 percent a year, you'll need a $ 1.25 million nest egg to replace each $ 50,000 salary. (compuquotes.com)