The present disclosure includes systems, methods, and non-transitory computer readable media that generate and provide return of incremental digital content user interfaces that improve performance and efficiency of multi-channel, multi-region digital content campaigns. In particular, one or more embodiments generate and provide a user interface that comprises a return of incremental digital content expenditure regression curve and return of incremental digital content expenditure point representations that accurately and intuitively detail digital content campaign expenditure efficiency for combinations of channels and regions during multiple time periods in a time window. For example, the resulting return of incremental digital content expenditure user interface effectively utilizes limited computing device display space and resources to enable a publisher to quickly and accurately optimize and project high level expenditure allocation in order to improve digital content campaigns.