Determining audience exposure involves calculating two key metrics: the number of unique individuals exposed to an advertisement (reach) and the average number of times those individuals are exposed (frequency). Reach is typically expressed as a percentage of the target audience, while frequency is a simple average. For example, a campaign reaching 60% of its target audience with an average exposure of four times per individual signifies a 60% reach and a frequency of 4.
Understanding these metrics is essential for optimizing advertising campaigns and budget allocation. Effective campaigns balance broad reach with sufficient frequency to ensure message memorability and impact. Historically, these calculations relied on estimated data from media outlets. However, the advent of digital advertising allows for more precise measurement and targeted delivery, enabling marketers to refine strategies for optimal results and demonstrably improved return on investment.