A calculation that results in an estimate that is too high
English: overestimate, overestimation, overrating, overreckoning
overestimateEnglish
overestimate, overestimation, overappraisal, overrate, overrating
Noun
An appraisal that is too high
English: overestimate, overestimation, overvaluation, overappraisal
Verb
Make too high an estimate of
English: overestimate, overrate
Assign too high a value to
English: overvalue, overestimate