1710, "carrying out calculations," prp. adj. from calculate. Meaning "shrewdly or selfishly seeking advantage" is attested from c.1810.
calculate
1560s, "to compute, to estimate by mathematical means," from L. calculatus, pp. of calculare "to reckon, compute," from calculus (see calculus). Meaning "to plan, devise" is from 1650s. Replaced earlier calculen (mid-14c.), from O.Fr. calculer. Related: Calculable