Attribution Window Explained: Why Your Reports Disagree

If Facebook says a campaign generated 80 sales this week but your store's own records show 50, you have not necessarily been overcharged — you are most likely looking at an attribution window problem, and understanding it is the fastest way to stop arguing with your own reports.

What an Attribution Window Actually Is

An attribution window is the length of time after someone sees or clicks an ad during which a resulting purchase still gets credited to that ad. A 7-day click window means any purchase within seven days of a click counts, even if the customer browsed elsewhere, closed their laptop, and came back on day six through a completely different route.

Click-Through vs View-Through Attribution

Click-through attribution only credits an ad if the person actually clicked it. View-through attribution credits an ad even if someone merely saw it and later converted without ever clicking — a much more generous, and much more debatable, form of credit that inflates results if leaned on too heavily.

The Standard Window Options

• 1-day click — the tightest, most conservative window, crediting only fast, direct responses.
• 7-day click — Meta's current default, balancing accuracy with capturing slower browse-then-buy behavior.
• 1-day view — credits someone who merely saw the ad and bought within a day without clicking at all.
• 28-day click — a much wider historical option, useful for high-consideration or B2B purchases with long research cycles.

Why the Default Window Changed

Meta's default used to be 28-day click plus 1-day view. After Apple's App Tracking Transparency rules arrived in 2021, Meta shifted the default down to 7-day click plus 1-day view, since longer windows require exactly the kind of persistent device-level tracking iOS now restricts. If an older ad account still reports on the old 28-day setting, expect a visible drop in reported conversions the day someone switches it, even though nothing about actual sales changed at all.

Why This Makes Every Platform's Numbers Look Different

Facebook, Google and TikTok each apply their own attribution window and model by default, and none of them can see what happens on the other platform. A customer who saw a Facebook ad, later searched on Google, and then clicked a Google ad before buying will often get counted as a full conversion by both platforms — that is not fraud, it is simply each platform crediting itself using its own window and its own visibility into the journey.

Choosing the Right Window for Your Business

An impulse-buy product with a low price point rarely needs anything beyond a 1-day or 7-day click window, since the decision happens fast. A considered purchase — furniture, B2B services, anything researched over days or weeks — genuinely benefits from a longer window, because a shorter one will make genuinely effective campaigns look like they are failing simply because the sale landed on day 12 instead of day 6.

How to Compare Platforms Fairly

• Match attribution windows across platforms where the settings allow it, instead of comparing a 7-day Facebook number to a 30-day Google number.
• Treat one system — GA4, your CRM, or actual order records — as the single source of truth for final budget decisions.
• Never add up ROAS from every platform and assume the total is your real return; overlapping credit means the sum will always overstate reality.

Attribution windows will never make every platform agree perfectly, and chasing that agreement wastes time better spent acting on the trends within each platform's own numbers. That is the practical approach AGUDOT takes too — reading each connected account's real performance on its own terms every day, and automatically pausing or resuming campaigns against your daily budget based on results, instead of waiting for a perfectly unified report that no ad platform will ever hand you.