Reference / Glossary / Measurement
Reach
The number of distinct people exposed to a campaign at least once. Reach is a person-level count and depends on the measurer's ability to recognize the same person across devices and sessions; platform reach within one platform is reliable, cross-platform reach requires a panel or identity graph and is estimated. Reach multiplied by average Frequency equals impressions.
Related terms
Used in The Signal
Cite this entry:
Agency Echelon. "Reach." Agency Echelon Reference, reviewed September 2026. https://agencyechelon.com/reference/glossary/reach/