Google Ads says Brand Lift generally begins reporting around 2,000 survey responses per metric; about 4,100 responses may be needed at the recommended minimum budget, and no lift after 16,800 responses may remain undetectable.
Read sourceGoogle current Google Ads Help, 2026- Applies to
- Eligible Google Ads Brand Lift studies
- Does not prove
- Platform-specific guidance, availability is limited, and response thresholds vary with true lift size and campaign performance.
