The Collaborative International Dictionary of English v.0.48:

Calculator \Cal"cu*la*tor\, n. [L.: cf. F. calculateur.]
   One who computes or reckons: one who estimates or considers
   the force and effect of causes, with a view to form a correct
   estimate of the effects.
   [1913 Webster]

         Ambition is no exact calculator.         --Burke.
   [1913 Webster]

Jargon File (4.4.4, 14 Aug 2003):

calculator
 n.

   Syn. for bitty box.


Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "calculator":
   CA, CPA, Comptometer, abacist, abacus, accountant,
   accountant general, actuary, adding, adding machine,
   analog computer, arithmograph, arithmometer, auditor,
   bank accountant, bank examiner, bookkeeper, calculating machine,
   cash register, certified public accountant, chartered accountant,
   clerk, comptroller, computation, computer, controller,
   cost accountant, cost keeper, counter, difference engine,
   digital computer, electronic computer, estimator, figurer,
   intriguer, journalizer, listing machine, machinator, maneuverer,
   manipulator, pari-mutuel machine, quipu, reckoner, recorder,
   registrar, rule, schemer, slide rule, sliding scale, statistician,
   strategist, suan pan, tabulator, tactician, wire-puller