Antonyms for the word "mis calculation" include "accurate calculation" and "correct estimation." A mis calculation occurs when an error is made in a calculation, leading to an incorrect result. However, accurate calculation and correct estimation refer to the process of making a correct calculation or estimation. These antonyms suggest that the correct and accurate calculation of numbers, measurements or outcomes is possible and often desirable. By taking extra care to ensure the accuracy of a calculation or estimation, it is possible to avoid costly mistakes, ensure the efficient use of resources and achieve desired outcomes.