miscalculate

[mis-kal-kyuh-leyt]
verb (used with object), verb (used without object), miscalculated, miscalculating.
to calculate or judge incorrectly: to miscalculate the time required.

Origin:
1690–1700; mis-1 + calculate

miscalculation, noun
miscalculator, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
miscalculate (ˌmɪsˈkælkjʊˌleɪt)
 
vb
(tr) to calculate wrongly
 
miscalcu'lation
 
n
 
mis'calculator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

miscalculate
1705; from mis- (1) + calculate. Related: Miscalculation.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The scariest thing isn't that the machine busted, broke, or that the scientists
  had made yet another miscalculation.
But whichever of the two was his intent, it seems to have been a miscalculation.
There are few enticing salads, a miscalculation given the crowd.
But the defense lawyer made what turned out to be a miscalculation.
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