The calculative eye of history, however, might identify it as Britain's most miserable hour since the Black Death some 600 years earlier.
From the time.com
After the procedure, he discovers that he is able to make predictions using his enhanced calculative skills, and change the future based on his discoveries.
From the en.wikipedia.org
More examples
Calculating: used of persons; "the most calculating and selfish men in the community"
Of, pertaining to, or involving calculation
The organisation has systems in place to manage hazards, however the system is applied mechanically. Staff and management follow the procedures but do not necessarily believe those procedures are critically important to their jobs or the operation.