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Paid AdsBenchmark2026-03
March 2026 Meta Reality: Attribution Changes Made CPAs Appear 15–30% Higher Without Real Performance Decline
Zentric Digital / industry data
Avg ecommerce roas2.79xResults
2.79x
Avg ecommerce roas
15–30%
Apparent cpa increase
Key tactics
- Distinguish real performance drops from attribution window changes
- Recalibrate targets after Meta's January–March 2026 measurement updates
- Use blended and incremental metrics alongside in-platform ROAS
Summary
Many advertisers saw CPA and ROAS worsen in March 2026. A significant portion of the change came from Meta's attribution updates (shorter windows, click definition changes) rather than actual campaign deterioration. Average ecommerce ROAS settled around 2.79x under the new rules.
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