Estimative

es·ti·mate  (st-mt)

tr.v. es·ti·mat·ed, es·ti·mat·ing, es·ti·mates

1. To calculate approximately (the amount, extent, magnitude, position, or value of something).

2. To form an opinion about; evaluate: "While an author is yet living we estimate his powers by his worst performance" (Samuel Johnson).

n. (-mt)

1. The act of evaluating or appraising.

2. A tentative evaluation or rough calculation, as of worth, quantity, or size.

3. A statement of the approximate cost of work to be done, such as a building project or car repairs.

4. A judgment based on one's impressions; an opinion.

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[Latin aestimre, aestimt-.]

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esti·mative adj.

esti·mator n.

Synonyms: estimate, appraise, assess, assay, evaluate, rate¹
These verbs mean to form a judgment of worth or significance. Estimate usually implies a subjective and somewhat inexact judgment: difficult to estimate the possible results in advance.
Appraise stresses expert judgment: appraised the works of art.
Assess implies authoritative judgment in setting a monetary value on something as a basis for taxation: assessing real estate for investors.
Assay refers to careful examination, especially to chemical analysis of an ore: will assay the ingot.
In extended senses appraise, assess, and assay can refer to any critical analysis: appraised his character; will assess the impact of higher taxes; assaying the idea's merit.
Evaluate implies considered judgment in ascertaining value: evaluating a student's thesis for content and organization.
Rate involves determining the rank or grade of someone or something in relation to others: rated the restaurant higher than any other in the city.