What does miscalculate mean?
Miscalculate means to perform a calculation or make an estimate incorrectly, often as the result of faulty data, reasoning, or assumptions. The verb is especially common in technical, financial, engineering, and statistical contexts: a team may miscalculate a cost, distance, quantity, or forecast. It can also be used more broadly for making a faulty judgment about circumstances, as when someone miscalculates how another person will react. The word conveys a definite error rather than mere uncertainty, since the result or expectation has been wrong. Miscalculation is the corresponding noun, while miscalculated and miscalculating are its inflected forms. Although the prefix “mis-” makes the meaning clear, the word remains useful in formal writing because it identifies a specific kind of failure involving numbers, measurement, prediction, or assessment.
To calculate or estimate a quantity, cost, distance, probability, or other value incorrectly.
"The contractor miscalculated the amount of material required for the roof."
Common in technical, financial, and analytical contexts.
To judge or anticipate a situation or outcome wrongly.
"The campaign miscalculated the strength of opposition to the proposed policy."
This figurative use implies an erroneous assessment based on a mistaken expectation.
A miscalculation can begin with one misplaced decimal point and end with a dramatically wrong decision.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does miscalculate come from?
Miscalculate is a 19th-century formation combining the prefix “mis-,” meaning “wrongly,” with “calculate.” Calculate ultimately comes through Medieval Latin from Latin calculare, a verb associated with calculus, meaning a small stone or pebble used for counting, and by extension with calculation and careful reckoning.
Related word forms
How miscalculate is actually used
The word is formal and commonly used in technical, financial, and analytical contexts. It is more emphatic than simply making an error because it specifically implies that a calculation or assessment produced the wrong result.