estimator

transitive verb estimated, estimating

1. to form an opinion or judgment about
2. to judge or determine generally but carefully (size, value, cost, requirements, etc.); calculate approximately

Origin: < L aestimatus, pp. of aestimare: see esteem

intransitive verb

noun

1. a general calculation of size, value, etc.; esp., an approximate computation of the probable cost of a piece of work made by a person undertaking to do the work
2. an opinion or judgment