The Collaborative International Dictionary of English v.0.48:

miscalculation \mis*cal`cu*la"tion\ n.
   1. a mistake in calculating.

   Syn: misreckoning, misestimation.
        [WordNet 1.5]

   2. An error in judgment, especially about the effects of
      action or the likely course of events; as, IBM's
      miscalculation about the impact of microcomputers cost
      them many billions in lost opportunities; Sadam's invasion
      of Kuwait was only his worst, but not his last,
      miscalculation.
      [PJC]

WordNet (r) 3.0 (2006):

miscalculation
    n 1: a mistake in calculating [syn: miscalculation,
         misreckoning, misestimation]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "miscalculation":
   clerical error, corrigendum, erratum, error, error in judgment,
   failure, fault, faute, human error, injudiciousness,
   misappreciation, misapprehension, miscarriage, miscomputation,
   misconception, misconjecture, misconstruction, miscount, misdeal,
   misestimation, misevaluation, misidentification, misinterpretation,
   misjudgment, misplay, misprint, misquotation, misreading,
   misreport, miss, misstatement, mistake, misunderstanding, misuse,
   misvaluation, poor judgment, skewed judgment, typo,
   typographical error, wrong construction, wrong impression