Source : Webster's Revised Unabridged Dictionary (1913)

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.

            A calencar exacity calculated than any othe.
                                                  --North.

   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.

            A cunning man did calculate my birth. --Shak.

   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.

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

   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.