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]

WordNet (r) 3.0 (2006):

calculator
    n 1: an expert at calculation (or at operating calculating
         machines) [syn: calculator, reckoner, figurer,
         estimator, computer]
    2: a small machine that is used for mathematical calculations
       [syn: calculator, calculating machine]

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



The Jargon File (version 4.4.7, 29 Dec 2003):

calculator
 n.

    Syn. for bitty box.


The Free On-line Dictionary of Computing (30 December 2018):

bitty box
calculator

    (Or "calculator") /bit'ee boks/ A computer
   sufficiently small, primitive, or incapable as to cause a
   hacker acute claustrophobia at the thought of developing
   software on or for it.  The term is especially used of small,
   obsolescent, single-tasking-only personal computers such
   as the Atari 800, Osborne, Sinclair, VIC-20, TRS-80
   or IBM PC, but the term is a general pejorative opposite of
   "real computer" (see Get a real computer!).

   See also mess-dos, toaster, toy.

   (1994-11-29)