›ACCOUNTINGto calculate an amount wrongly: The water company had deliberately miscalculated the data it supplies to the regulator.The insurance company admitted that it had miscalculated one of its pension funds by around £15m.
›to judge a situation badly: The biggest problem was that the airlines miscalculated demand.badly/seriously/horribly miscalculateThe Dutch had badly miscalculated just how much London would control the newly merged companies.