The Collaborative International Dictionary of English v.0.48:

Calculate \Cal"cu*late\, v. i.
   To make a calculation; to forecast consequences; to estimate;
   to compute.
   [1913 Webster]

         The strong passions, whether good or bad, never
         calculate.                               --F. W.
                                                  Robertson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Calculate \Cal"cu*late\, v. i. [imp. & p. p. Calculater; p.
   pr. & vb. n. Calculating.] [L, calculatus, p. p. of
   calculate, fr. calculus a pebble, a stone used in reckoning;
   hence, a reckoning, fr. calx, calcis, a stone used in gaming,
   limestone. See Calx.]
   1. To ascertain or determine by mathematical processes,
      usually by the ordinary rules of arithmetic; to reckon up;
      to estimate; to compute.
      [1913 Webster]

            A calencar exacity calculated than any othe.
                                                  --North.
      [1913 Webster]

   2. 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; as, to calculate or cast one's nativity.
      [1913 Webster]

            A cunning man did calculate my birth. --Shak.
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   3. To adjust for purpose; to adapt by forethought or
      calculation; to fit or prepare by the adaptation of means
      to an end; as, to calculate a system of laws for the
      government and protection of a free people.
      [1913 Webster]

            [Religion] is . . . calculated for our benefit.
                                                  --Abp.
                                                  Tillotson.
      [1913 Webster]

   4. To plan; to expect; to think. [Local, U. S.]

   Syn: To compute; reckon; count; estimate; rate.

   Usage: To Calculate, Compute. Reckon, Count. These
          words indicate the means by which we arrive at a given
          result in regard to quantity. We calculate with a view
          to obtain a certain point of knowledge; as, to
          calculate an eclipse. We compute by combining given
          numbers, in order to learn the grand result. We reckon
          and count in carrying out the details of a
          computation. These words are also used in a secondary
          and figurative sense. "Calculate is rather a
          conjection from what is, as to what may be;
          computation is a rational estimate of what has been,
          from what is; reckoning is a conclusive conviction, a
          pleasing assurance that a thing will happen; counting
          indicates an expectation. We calculate on a gain; we
          compute any loss sustained, or the amount of any
          mischief done; we reckon on a promised pleasure; we
          count the hours and minutes until the time of
          enjoyment arrives" --Crabb.
          [1913 Webster]

WordNet (r) 3.0 (2006):

calculate
    v 1: make a mathematical calculation or computation [syn:
         calculate, cipher, cypher, compute, work out,
         reckon, figure]
    2: judge to be probable [syn: calculate, estimate, reckon,
       count on, figure, forecast]
    3: keep an account of [syn: account, calculate]
    4: predict in advance [syn: forecast, calculate]
    5: specifically design a product, event, or activity for a
       certain public [syn: calculate, aim, direct]
    6: have faith or confidence in; "you can count on me to help you
       any time"; "Look to your friends for support"; "You can bet
       on that!"; "Depend on your family in times of crisis" [syn:
       count, bet, depend, look, calculate, reckon]

Moby Thesaurus II by Grady Ward, 1.0:

100 Moby Thesaurus words for "calculate":
   add, add up, algebraize, appraise, appreciate, arrange, ascertain,
   assay, assess, bank on, build on, calibrate, caliper, cast,
   check a parameter, cipher, compute, concert, consider, contrive,
   count, count on, cut out, depend, design, determine, devise, dial,
   discover, divide, dope out, estimate, evaluate, extract roots,
   fathom, figure, figure in, figure out, forecast, forethink, frame,
   gauge, graduate, intend, lay plans, lot, make a projection,
   make arrangements, measure, mensurate, mete, meter, methodize,
   multiply, organize, pace, plan, plan ahead, plot, plumb,
   prearrange, premeditate, preresolve, price, prize, probe, program,
   project, quantify, quantize, rate, rationalize, reckon, reckon on,
   schedule, schematize, scheme, score, set up, shape, size, size up,
   sound, span, step, study, subtract, survey, systematize,
   take a reading, take account of, tally, triangulate, trust in,
   valuate, value, weigh, work out, work out beforehand, work up