"later calculate" is correct and usable in written English.
You can use it when you want to postpone an action or think about something before you calculate it. For example: "I will collect all the necessary data first, and later calculate the total cost of the project."
A small river (the Browney, I later calculate) winds through a watermeadow.
At this moment, the Rockets' front office would later calculate, the team's chances of winning rose from 19.2percentto72.6percentcent.
"We can capture the light rays in a scene and then later calculate a photo at any focal length," he said.
It's perfectly compatible with the uncertainty principle as it functions in this theory that I measure position exactly and then later calculate the system's velocity exactly.
He would later calculate, associates said, that his absence had been therapeutic, for him personally and for his political career, which did not seem at that point to be a candidate for rebirth.
Dworman later calculated that the table had been moved thirty-three inches.
Nissan later calculated the Leaf, using the same method, at 367 miles per gallon.
But two economists later calculated that about 1,300 extra one-year-old Americans were trying to stand up and walk at the end of that year.
The family later calculated it took six minutes for the tornado to flatten their house, demolish their cars and swallow most of their possessions.
It was later calculated that, even without the possibility of mechanical or electrical failure, there was still more than a one-in-ten chance of the gadget failing to perform optimally.
Local tourist chiefs, who joined village head men clutching joss sticks and flowers in a memorial service on Thong Krut beach, could be heard only hours later calculating that the murdered British student had cost Samui 150m baht (£2.2m) as British visitor numbers had immediately slumped by 30%.
