An estimator is a professional, often in the construction trade, whose job it is to deliver an accurate estimate of the cost of work requested by a potential client, usually to bid for a project. Estimators must understand the full scope of the project, as well as the material and labor costs, to provide an accurate estimate of costs. Estimators are good with math, have a sense of the common problems which may arise during a project, and can account for variances in materials and labor costs to provide accurate estimations.