Facebook Ads Attribution: Why Your Numbers Look Wrong (and How to Read Them)
You close 50 sales this week. Facebook Ads Manager says it drove 80 of them. Google Analytics says Facebook drove 12. Your actual orders are 50. Which number is right? None of them, and all of them — they are measuring different things with different rules. Attribution is one of the least understood topics in digital advertising, and getting it wrong leads to over-crediting Facebook and under-investing in channels that are actually working.
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What attribution windows mean
An attribution window is the period of time after someone sees or clicks your ad during which Facebook will claim credit for a conversion. The default is 7-day click, 1-day view. This means: if someone clicks your ad today and buys anything from your store within the next 7 days, Facebook claims that conversion. If someone sees your ad today (without clicking) and buys tomorrow, Facebook also claims that conversion under 1-day view.
Why Facebook attribution always looks inflated
- View-through attribution: Facebook credits conversions from people who saw (not clicked) the ad. These people may have converted anyway from a Google search, email, or direct visit.
- Cross-device attribution: Facebook tracks across devices better than most platforms because users are logged in on phone and desktop. This picks up conversions other platforms miss.
- Multiple channel overlap: a customer who saw your Facebook ad, then clicked a Google ad, then bought direct will be counted by both Facebook AND Google as their conversion.
- Long click windows: the default 7-day click window means someone who clicked your ad on Monday but was already planning to buy by Friday gets attributed to your ad.
The attribution settings that give cleaner data
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| Setting | When to use it | Trade-off |
|---|---|---|
| 7-day click only | E-commerce, short purchase cycles | Removes view-through inflation |
| 1-day click only | Impulse purchases, very short cycle | Most conservative, may undercount |
| 7-day click + 1-day view | Default — balanced for most | Some view-through inflation |
| 28-day click | High-consideration B2B or high-ticket | May overcredit for long journeys |
The most useful attribution comparison: look at your actual business revenue (from your payment processor or order management system) alongside your Facebook-reported conversions. If Facebook claims 3x more conversions than you actually received, your view-through attribution is inflating numbers. Switch to 7-day click only and watch the reported conversions drop to something closer to reality.
Questions people ask
Should I trust Facebook Ads Manager conversion numbers?
Use them as a directional signal, not an absolute truth. Facebook-reported conversions are useful for comparing ads against each other (ad A vs ad B, same attribution window). They are not reliable for calculating absolute ROAS against your actual revenue. Use your business revenue data for that.
What is the difference between click-through and view-through attribution?
Click-through attribution only credits conversions where the person actually clicked your ad. View-through attribution also credits conversions from people who only saw your ad but did not click. View-through can significantly inflate reported conversions for awareness campaigns — someone sees your ad, searches your brand name on Google, and converts. Facebook claims the conversion, Google also claims it, but your business only has one sale.