Calculated Field
A calculated field is an attribute whose value is determined by the values of other attributes or system variables. For example, the value of the attribute "Area of Rug" might be calculated by multiplying the value of the attribute "Rug Length" by the value of the attribute "Rug Width". The values of calculated fields are not determined until the record is saved, both in the case of a new record being added and when an existing record is being edited. If a user edits a value in a calculated field, depending upon system configuration it may be overwritten with the system-derived value when the record is saved.