Quantitative relationships between true elastic properties are not always applicable to inverted elastic properties. We use the important example of two-term AVO reflectivity inversion to demonstrate this. AVO literature includes many examples of two-term AVO equations, and we provide a general relationship to convert between inverted reflectivities obtained when using these various equations. Conversion between inverted reflectivities should be based on this equation, rather than standard elastic-property relationships. This is of immediate importance when applying the method of chi-angle projections to estimate elastic reflectivities.