Abstract: The purpose of this patent application is to secure the exclusive right for the expression of diminished value represented as a percentage or decimal equivalent. In the field of automotive valuation there is no way to provide equality between wholesale & retail automobile markets & conflicting values—other than using percentage or decimal equivalent. At the time of this application, there is currently no standardized or truly interchangeable format in which diminished value may be calculated—especially one in which value of diminishment may be calculated using any and all existing wholesale or retail vehicle value sources. This invention will provide consumer protection from any automobile industry professional when their automobile is involved in an incident that would reduce the value of a vehicle. It will also allow for the general public to have access to the same information as any industry professional needing to determine diminished value.