miscalculate

If you add two plus two and get five, you miscalculate. In other words, you've added the numbers incorrectly.

You can use the verb miscalculate when you're talking about actual mathematical calculations, or when you measure something in an inexact way and get it wrong. Another way to use the word is to mean "judge incorrectly," which happens when you guess that your grandmother will laugh after sitting on a whoopie cushion, but you guess wrong. Mis, in this word, means "bad or wrong," and calculate means "to compute or estimate."

Definitions of miscalculate
  1. verb
    calculate incorrectly
    “I miscalculated the number of guests at the wedding”
    synonyms: misestimate
    see moresee less
    type of:
    calculate, cipher, compute, cypher, figure, reckon, work out
    make a mathematical calculation or computation
  2. verb
    judge incorrectly
    synonyms: misestimate
    see moresee less
    type of:
    misjudge
    judge incorrectly
Word Family
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