Mis-estimate is the act of incorrectly calculating or evaluating something. In contrast, the antonyms of mis-estimate are "calculate," "estimate," "ascertain," "evaluate," "appraise," "determine," and "gauge." These antonyms refer to the correct way of gauging something's value, size, or scope. For instance, if you want to estimate the cost of the project, you'll have to calculate it correctly, or else you may end up with a mis-estimate. Accurate estimation is crucial, especially when it involves project management or business planning, as a mis-estimate can lead to unexpected delays, cost overruns, and other problems. So, to avoid mis-estimation, use these antonyms to calculate and estimate accurately.