What attribution window should you use for Meta ads?
For most accounts the right starting point is Meta's default, which since the March 2026 changes is 7-day click-through, 1-day engage-through, and 1-day view-through. We move off it only for a reason, such as a 1-day click window for impulse buys and flash sales, and we never compare two periods or two accounts that used different windows. Changing the setting only changes what Meta reports, so a switch from 7-day click plus 1-day view to 1-day click can make ROAS look 30 to 50 percent lower even though nothing about the ads changed.
Key takeaways
- Since March 2026 a like, save, or 5-second video view counts as engage-through, and only a link click counts as a click.
- Start on Meta's default and switch to 1-day click only for impulse buys, single-session products, or flash sales.
- An attribution window decides which conversions Meta counts, so changing it rewrites reports and leaves sales alone.
- A 20 to 30 percent gap between Meta and Shopify is normal, and a much wider one usually means a Conversions API problem.
What did Meta change about attribution in March 2026?
Meta narrowed a click to mean a link click and moved every other interaction into a new engage-through category with a fixed 1-day window. The new default reads 7-day click-through, 1-day engage-through, and 1-day view-through.
The change came in a Meta business post on March 3, 2026, titled "Simplifying Ad Measurement for a Social-First World." TheOptimizer's May guide walks through it. Likes, comments, shares, saves, and video views of 5 seconds or more used to be able to earn click credit. Now they sit in engage-through, which is its own bucket with its own window, and nobody should read it as a softer kind of click.
The same change cut the engaged-view threshold for video from 10 seconds to 5. In practice, a person who watched five seconds of your ad and bought the next morning lands in a different column than a person who tapped through to your site.
Search this question and the pages that rank for it disagree on what the default even is. Guides written after March describe engage-through. Others, Jetfuel Agency's August 7 window table among them, still list 7-day click plus 1-day view and a 15-second engaged view. That August guide is also the newest source we found, which is older than we would like for a setting Meta changed this year.
Which window fits which kind of campaign?
Meta's default fits most sales and lead campaigns, and a 1-day click window fits products people decide on in one visit. We do not think one window is right for every account.
Jetfuel Agency recommends 1-day click for impulse purchases, single-session products, and flash sales. The logic holds up. If a buyer decides in one sitting, a seven-day window mostly collects credit for purchases the ad had little to do with. For a considered purchase the longer window is closer to how people actually buy.
The trade-off is noise against undercounting. A short window reports fewer conversions, and the ones it keeps are easier to believe. A long one catches the slow buyers and some who would have bought anyway, and Meta's report cannot tell you which is which.
| Campaign | Window we start with | Why |
|---|---|---|
| Most sales and lead campaigns | Meta's default: 7-day click, 1-day engage, 1-day view | It is what Meta reports on today |
| Impulse buys and single-session products | 1-day click | Jetfuel Agency recommends it when people decide in one visit |
| Flash sales | 1-day click | Jetfuel Agency lists flash sales among its 1-day click cases |
| Comparing this month to an earlier one | Whatever the earlier period used | Two windows produce two sets of numbers that cannot be compared |
Does switching the setting change your results or only your reports?
Only your reports. The same ads and the same revenue get counted under different rules.
Jetfuel Agency warns that an account moving from 7-day click plus 1-day view to 1-day click will see ROAS look 30 to 50 percent lower even if nothing changed. The ads are the same. The ruler moved.
Before touching the live setting, open Compare Attribution Settings in Ads Manager. It splits conversions into click-through, engage-through, and view-through without changing anything that is running. TheOptimizer estimates 15 to 30 percent of reported conversions may be view-through, so that column is worth reading first.
Whether those view-through buyers would have bought without the ad is a question the comparison view does not answer. We have not found a report inside Meta that does.
Why does Meta's number never match Shopify?
Shopify credits the last click, and Meta credits any conversion inside its window, so the two count the same sale in different places. Jetfuel Agency calls a 20 to 30 percent gap typical.
Comparing Meta-reported ROAS straight to Shopify revenue is one of the five attribution mistakes Jetfuel Agency lists from its account audits. A person who saw your ad on Tuesday and came back through a Google search on Friday is a Meta conversion and a Google sale at the same time. Neither report is lying.
When the gap runs well past 30 percent, Jetfuel points to the Conversions API, the connection that sends purchase events from your store to Meta. We would fix that before any argument about windows. GA4 also credits sales by its own rules, so expect it to disagree with both.
Where the facts in this piece come from
FAQs about What attribution window should you use for Meta ads
1. Should I compare two ad accounts that use different attribution windows?
No. Put both accounts on the same window, or read both through Compare Attribution Settings under matching rules, before you compare ROAS or cost per purchase.
2. Does engage-through attribution count as a click?
No. Since Meta's March 3, 2026 change, a click means a link click. Likes, comments, shares, saves, and video views of 5 seconds or more count as engage-through, which has a fixed 1-day window and its own column in reporting.
3. How often should I change my Meta attribution window?
Rarely. Pick a window that matches how your buyers decide, keep it, and note the date whenever you change it. Every change breaks the comparison with every report that came before it.
About Corvan
Corvan makes Corvan AI, AI agents that run your marketing: they plan your campaigns, write every post in your voice, and show you which posts booked meetings. The team also runs go-to-market services: consultation, ad operations, and AI search ranking. Every piece under Resources is written by the team that runs the work, with sources. Meet the team on the team page, or read what it returned for Drive Me Barcelona.
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