calculates

third-person singular simple present indicative of calculate

(transitive) To determine the value of something or the solution to something by a mathematical process.
(intransitive) To determine values or solutions by a mathematical process; reckon.
(US, dialectal, intransitive) To plan; to expect; to think.
To ascertain or predict by mathematical or astrological computations the time, circumstances, or other conditions of; to forecast or compute the character or consequences of.
To adjust for purpose; to adapt by forethought or calculation; to fit or prepare by the adaptation of means to an end.
To imagine sequences of potential moves and responses without actually moving the pieces.