IPA: /ˌmɪsˌkæl.kjʊˈleɪ.ʃən/
KK: /mɪsˌkæl.jʊˈleɪ.ʃən/
An error made in calculating something, leading to an incorrect result.
The engineer realized there was a miscalculation in the project budget.
Miscalculation → It is formed from "mis-" (meaning wrong or badly) and "calculation" (from Latin "calculatio", meaning counting or reckoning). The word refers to a counting or reckoning that is done incorrectly or wrongly.
Think of doing a 'wrong' ('mis-') 'counting' ('calculatio') — that's why miscalculation means an incorrect calculation.