MRC (Media Rating Council)

The definitive independent accreditation and standards body for media measurement in the U.S. advertising industry, with growing global influence.

The Media Rating Council (MRC) is a non-profit industry organization founded to ensure valid, reliable, and effective audience measurement across all media. Originally established in the 1960s following a U.S. Congressional investigation into broadcast ratings practices, the MRC has evolved into the authoritative accreditation body for media measurement in the United States and increasingly globally. Its core function is to audit and accredit measurement services — including digital ad impression counting, viewability, brand safety, and audience measurement — ensuring they meet rigorous standards for methodology, data collection, and reporting. In the digital advertising ecosystem, the MRC plays a critical role by defining what constitutes a valid ad impression, setting viewability standards (such as the widely adopted 50% pixel/1-second standard for display ads), and accrediting third-party measurement and verification vendors. Major players including Nielsen, comScore, DoubleVerify, Integral Ad Science, and Google's measurement tools have sought or maintained MRC accreditation as a mark of credibility and industry trust. The MRC also publishes detailed guidelines and standards documents that shape how the entire industry measures and transacts on media. The MRC's significance in the AdTech ecosystem cannot be overstated: its accreditation is often a prerequisite for measurement vendors seeking adoption by major advertisers, agencies, and publishers. The organization works closely with industry trade bodies such as the IAB, 4A's, ANA, and NAB, and its standards committees include representatives from across the media and advertising supply chain. As measurement complexity grows — spanning connected TV, streaming audio, cross-platform attribution, and attention metrics — the MRC continues to expand its standards framework to address emerging challenges.