From The Collaborative International Dictionary of English v.0.48 :
Calculative \Cal"cu*la*tive\, a.
Of or pertaining to calculation; involving calculation.
[1913 Webster]
Long habits of calculative dealings. --Burke.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
calculative
adj 1: used of persons; "the most calculating and selfish men in
the community" [syn: calculating, calculative,
conniving, scheming, shrewd]