Entry 2 senses Webster, 1913 Miscalculate /mĭs-kăl'-kyəl-ātˌ/ · Mis·cal·cu·late · IPA /mɪsˈkælkjʊleɪt/ 01 v. t. & i. To calculate erroneously. 1. To calculate erroneously. 2. To judge wrongly, especially about the effects of action or the likely course of events.