Summary
The minimum daily budget should be $150. Demand Gen campaigns using Target CPA bidding need a daily budget of at least 10 times the target cost per action, so a $15 target requires $150 per day. Anything lower leaves the campaign budget-constrained and short on conversion data during the learning period.
Nitin Batra is a Google Video Ads certified professional who plans and manages Demand Gen and YouTube video campaigns, including budget and Target CPA bid configuration in Google Ads.
Last updated: August 23, 2026
For a Demand Gen campaign using Target CPA bidding at $15 per conversion, the minimum daily budget should be $150, which follows the recommended 10x target CPA rule for Demand Gen campaigns.
- $15
- $75
- $150
- $1,500
The correct answer is: $150
Key Takeaways
- – The minimum daily budget for a Demand Gen campaign with a $15 target CPA is $150, which is 10 times the target CPA.
- – Google recommends 10x the target CPA as the daily budget for Demand Gen so the campaign can collect enough daily conversions during the learning period.
- – Target CPA is an average, not a cap, so individual conversions will cost more or less than $15 while the campaign works toward that average over time.
- – Setting the budget close to the target CPA triggers a limited by budget status, throttles delivery, and produces unstable CPAs that make creative and audience testing unreliable.
Why does Google recommend 10 times the target CPA as the daily budget for Demand Gen?
The multiplier is there to guarantee the campaign can afford roughly ten conversions a day at the target price. That volume gives the bidding system a steady stream of conversion data to price auctions against. With a budget of one or two times the target CPA, the campaign spends out early in the day, misses most of the auction cycle, and never builds a stable pattern.
Where do I set the target CPA and daily budget in a Demand Gen campaign?
In Google Ads, create the campaign, choose the Demand Gen campaign type, then set Bidding to Conversions and enter your target cost per action. The daily budget field sits in the Budget and dates section of the same setup flow. Both can be edited later from the campaign settings page without restarting the campaign, though large target changes will push it back into learning.
Does raising the target CPA mid-flight require raising the budget too?
Yes, if you want to keep the same headroom. The 10x guidance is tied to the target, so moving a target CPA from $15 to $25 means the recommended daily budget moves from $150 to $250. Changing the target by more than about 20 percent at a time also restarts the learning period, so make adjustments in smaller steps and give each one a week or two.
What happens if the campaign genuinely cannot spend the full $150 a day?
That is fine. Daily budget is a ceiling, not a commitment, and Google will only spend what the auctions and your audience size allow, averaging spend across the month. The risk you are protecting against is the opposite case, where demand exists but the budget cuts delivery off. Check the Status column in the Campaigns table for a limited by budget label to confirm which situation you are in.