MISCALCULATE

[verb] - to calculate (an amount) wronglyWe had a lot of food left over from the party because I'd miscalculated how much people would eat. [+ wh- word](figurative) The management has miscalculated (= judged badly) the union's determination to win this dispute. [T](figurative) He miscalculated badly when he underestimated the response of the international community to the invasion. [I]