Meta Ads Fundamentals

The Meta Auction — Total Value Formula

Meta's ad auction is not a simple bid-vs-bid system. It uses a Total Value formula:

Total Value = Bid × pAction + Quality Score

Where:

• Bid: Your actual bid or the max you're willing to pay
• pAction: Probability that the right person will take the desired action (click, conversion, etc.)
• Quality Score: Meta's assessment of your ad's relevance and quality vs. competitors

What this means in practice:

• A high bid with a low-quality ad may lose to a lower bid with a highly relevant ad
• Two advertisers with identical bids can get different results based on their ad quality
• Optimization should address both bid strategy and creative relevance simultaneously