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, [[auctioneer]]s or [[realtor]]s may provide an estimate of the proposed cost of something, as a guideline for the ultimate price which is to be paid.