Google says Brand Lift may begin reporting around 2,000 responses per metric for high-performing campaigns, expects detectable lift around 4,100 responses at the recommended budget, and may fail to detect lift after 16,800 responses per metric.
Read sourceGoogle Current Google Ads Help; accessed 2026-08-23- Applies to
- Eligible Google Ads Brand Lift studies and survey responses per lift metric.
- Does not prove
- Thresholds are platform-specific, vary with lift size and campaign volume, and are not a general sample-size rule for all brand tracking.
