Forecasting-based management of advertisement delivery and inventory

Methods and systems for managing advertisement (ad) delivery and ad inventory for advertisements (ads) placed in video content are provided. An exemplary method receives campaign criteria for a new advertising campaign, the campaign criteria including at least a desired date range. The method then retrieves indications of unsold ad space inventory. In response to determining, based at least in part on the unsold ad space inventory in the desired date range, that the campaign criteria cannot be satisfied, the method: renders, in a user interface, an interactive ad delivery and distribution report indicating forecasted ad distribution and ad delivery for at least part of the desired date range during which the campaign criteria cannot be satisfied; and redistributes ad delivery by adjusting an ad delivery plan based on adjusted report parameters received via the interface in order to accommodate the new advertising campaign.