Should I kill an underperforming ad or give it more time?
Kill an ad once it has spent about 2 times your target CPA with no conversion, or sits clearly below the account average after a readable sample, usually 3 to 4 days. Giving it more time only makes sense if spend is still below one target CPA; otherwise you are funding noise.
The case for killing faster than feels comfortable
Most operators wait too long to kill. The emotional bias is toward giving creative more runway because someone spent time making it. The practical cost is that every dollar spent on a confirmed loser is a dollar not scaling a confirmed winner. Dead budget in a losing ad set is the most common waste in paid social.
The narrow case for waiting
Wait if total spend is below one times your target CPA. At that level there is genuinely not enough signal to read. Also wait if the ad is in the first 48 hours and spend is climbing but conversions have not started. Some campaigns need 36 to 48 hours for the pixel to connect delivery to purchase events, especially with longer purchase windows.
What to do before you kill
Check the funnel. If the ad has strong hook and hold rates but poor conversion, the problem may be landing page or offer, not the creative. Kill the creative only after ruling out downstream issues. That diagnosis shapes the next brief.
Related questions
Should I ever retest a killed creative later?
Yes, if the audience has refreshed or the offer has changed. A creative that failed on a fatigued audience or against a weak offer is worth retesting under different conditions.
What if the whole account CPA is above target, making it hard to compare?
Set a relative threshold: kill ads that are more than 30 to 40 percent above the account average CPA after a readable sample, even if the absolute number is not ideal.
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