Performance Max (PMax)
Google's automated campaign type that spans Search, YouTube, Display, Gmail, Maps, and Discover.
Performance Max (PMax) is Google's cross-channel automated campaign type that uses a single campaign structure and asset set to serve ads across all Google inventory — Search, YouTube, Display Network, Gmail, Maps, and Discover — optimized toward a single conversion goal.
Context
PMax works well for ecommerce with clean product feeds, high conversion volume, and clear brand signal. It works poorly for lead-gen without lead scoring, service businesses without location feeds, or accounts with fewer than 50 conversions per week.
PMax cannibalization of branded search is a persistent issue. Most advertisers should use negative keyword exclusions to prevent PMax from serving on branded queries that would have converted organically.
An ecommerce account adding PMax alongside existing Search and Shopping campaigns typically sees 15–30% incremental revenue — but only when branded search is excluded. Without exclusion, 60–80% of the reported PMax 'wins' cannibalize cheaper branded-search conversions.
PMax reporting is opaque. You can't see placement-level performance by default; Google reveals asset performance but not which channel drove which conversion. This opacity is a feature for Google and a headache for advertisers.
Related terms
Services that apply this
More Paid Media terms
CAC (Customer Acquisition Cost)
The fully-loaded cost of acquiring a new paying customer.
CAC Payback Window
The number of months until a new customer's contribution margin equals the cost to acquire them.
LTV:CAC Ratio
Customer lifetime value divided by customer acquisition cost.
MER (Marketing Efficiency Ratio)
Total revenue divided by total marketing spend — a blended metric that resists attribution gaming.