The objective of this study is to establish correlation between toner conductivity measured in a pressed pellet, and conductive properties of an individual toner particle. Electrical conductivity of toners with conductive surface additives was measured as a function of applied voltage, pellet pressure and additive surface area coverage. Conductivity of toner pellets increases with additive surface area coverage in a percolation manner, and depends on additive-to-toner size ratio, and applied pressure. Possible sources of errors of pellet measurements include enhancement of inter-particle contacts and migration of the additives under high pressure.