Measurement
How do I test ad creative with statistical significance?
Last reviewed 22 April 2026 · Reviewed by Jake McQuillan
Quick answer
How do I test ad creative with statistical significance?
Run 2-4 creatives per ad set for 14-21 days, target 95% confidence using a CPL calculator, judge on downstream conversion, not just CTR or CPL.
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Test design
- 2-4 variants per ad set
- Min 50 conversions per variant (Meta learning phase minimum)
- 14-21 day window
- 95% confidence via CPL calculator (Convertize, Optimizely)
Judge on
Booked-consultation rate, not CTR. CTR winners often have weaker downstream conversion.
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