Methods, apparatus, systems and articles of manufacture are disclosed to estimate media audience consistency. An example apparatus disclosed herein includes a record manager to access media measurement data communicated via a network from a plurality of media monitors, the media measurement data corresponding to a plurality of panelists. The apparatus further includes a consistency calculator to determine a first number of the panelists exposed to a first quantity of a first broadcast, determine a second number of the panelists exposed to a second quantity of the first broadcast, and output a consistency metric associated with the first broadcast, the consistency metric being based on a variation of at least the first number and the second number.