Estimate

To estimate is to form an opinion or judgement concerning a degree of measurement or quality about an object or person; such as worth, value, size, weight, volume, etc.. By nature an estimate is subjective and its value depends on the expertise of the the estimator. Although commonly used as a synonym for guess an estimate is expected to be close to the real quantifiable value.

Tradesmen, auctioneers or realtors may provide an estimate of the proposed cost of something, as a guideline for the ultimate price which is to be paid.