# Meta Says 7-Day Click, GA4 Says Data-Driven: Why the Two Numbers Never Match

Source: https://attributionplaybook.com/blog/2026-11-10-meta-7-day-click-1-day-view-vs-ga4.html

November 10, 2026

*Meta Ads Manager says 120 conversions. GA4 says 84. The finance team asks which one is right, and the honest answer is both, because they are not measuring the same thing, and the gap between them is not an error, it is the design.*

## Two different questions, two different answers

Meta's default attribution setting is 7-day click, 1-day view. A conversion counts if the person clicked the ad and converted within seven days, or saw the ad without clicking and converted within one day. Meta also dates the conversion on the day of the ad interaction, not the day of the sale, and it tracks logged-in users across devices, so an ad viewed on a phone and a purchase made later on a desktop still counts. GA4 works the other way. Its default is cross-channel data-driven attribution, which distributes credit across every touchpoint in the journey, and it only counts a conversion once a user lands on the site through a trackable channel. It does not count view-through conversions at all.

The numbers that follow from that are not small. Meta typically reports about 26 percent more conversions than analytics tools, per the Varos industry benchmark from 2024, and GA4 underreports paid conversions by 18 to 35 percent when cookies are rejected or blocked, per Cardinal Path's 2024 analysis. Neither platform is lying. Meta is answering how many conversions touched a Meta ad. GA4 is answering how many conversions the site can attribute across all channels. The gap is the view-through conversions, the cross-device journeys, and the modeled conversions that one system sees and the other does not.

## The three mistakes that make it worse

The first mistake is adding the two numbers together. A customer who clicks an Instagram ad on Tuesday, then Googles the brand and buys through a Google Ads click on Thursday, is one sale. Meta claims it under 7-day click, GA4 splits it or gives it to search, and adding the two reports counts the sale twice. The second mistake is comparing windows: this month's 7-day click numbers against last month's 1-day click numbers, which is a different ruler, not a trend. The third mistake is optimizing on the platform number alone. If Meta's window is generous and GA4's is strict, the campaigns that look best in Ads Manager are the ones with the most view-through credit, not the ones that drove the most incremental sales.

The fix is a third number, and it is the only one that decides budget: incrementality. Hold out a group, run the campaign, and measure the difference in total sales between the exposed group and the holdout. That number is smaller than Meta's number and smaller than GA4's number, and it is the only one that says what the ads actually added. For the incrementality version of this, see [Incrementality Tests You Can Run Without a Data Team](https://attributionplaybook.com/blog/2026-11-09-incrementality-tests-run-without-data-team.md), and for the window question in detail, [Meta 7-Day Click vs GA4 90 Days: What the Window Hides](https://attributionplaybook.com/blog/2026-11-08-meta-7-day-click-vs-ga4-90-days.md).

## What to report instead

Report all three numbers, labeled, every time: Meta's attributed conversions with the window named, GA4's conversions with the model named, and the incrementality read when you have one. Never report one number without its window and its model, because a conversion count without a window is a number without a unit. The finance team does not need the platforms to agree. They need to know what each number is counting, and which one decides the budget.

## Frequently asked questions

### Why does Meta report more conversions than GA4?

Meta's default is 7-day click and 1-day view, it counts view-through conversions, and it dates conversions on the ad interaction. GA4 uses data-driven attribution across channels, ignores views, and dates conversions when they happen. The gap is the design, not an error.

### What is a view-through conversion?

A conversion from someone who saw the ad, did not click, and converted within the view window. Meta counts them by default. GA4 does not count them at all.

### Can I add Meta and GA4 conversions together?

No. The same sale can appear in both reports, and adding them double counts it. A customer who clicks an Instagram ad and later buys through a Google search is one sale, claimed by both systems.

### Which number should decide budget?

Incrementality: the difference in total sales between an exposed group and a holdout. It is smaller than either platform number, and it is the only one that says what the ads actually added.