When you look at conversions in Meta Ads Manager, those numbers do not include every sale or lead that ever happened — they only include conversions that fall within your attribution window. Understanding how that window works, and choosing the right one for your business, is one of the most overlooked factors in Meta advertising.
This guide explains exactly what Meta’s attribution settings mean, the difference between click and view attribution, and how to configure the right window so your Ads Manager data reflects reality.
What Is Attribution in Meta Ads?
Attribution is the process of assigning credit for a conversion to an ad. When someone sees or clicks your ad and then makes a purchase, Meta needs to decide whether that ad caused the purchase.
The attribution window is the time limit Meta uses to make that decision. If a purchase happens within the window after an ad interaction, Meta credits your ad with the conversion. If it happens outside the window, the conversion is not counted in your campaign.
This affects your reported conversions, your ROAS, and critically, how Meta’s algorithm optimises your campaigns. The algorithm sees only the conversions within your attribution window. If your window is too short, the algorithm works with incomplete data and may bid too conservatively.
The Four Attribution Windows Meta Offers
| Window | What It Counts |
|---|---|
| 7-day click | Conversions within 7 days of clicking your ad |
| 1-day click | Conversions within 24 hours of clicking your ad |
| 1-day view | Conversions within 24 hours of seeing (not clicking) your ad |
| 7-day click + 1-day view | Conversions within 7 days of a click OR 1 day of a view |
Meta’s current default is 7-day click + 1-day view. This was changed from the old default of 28-day click + 1-day view after iOS 14 made long-window attribution less reliable for opted-out users.
7-Day Click Attribution Explained
A 7-day click window means: if someone clicks your ad and then converts within the next 7 days (168 hours), that conversion gets credited to your ad.
This is the most commonly used window for ecommerce and direct-response campaigns. It captures people who:
- Click your ad, browse, and return to buy 2 to 3 days later
- Click your ad on mobile and complete the purchase on desktop the next day
- Need a few days to decide after clicking, which is common for higher-priced products
7-day click is appropriate for products with a multi-day consideration period — anything above £30 to £50 where buyers typically research before purchasing.
1-Day View Attribution Explained (and Why It Is Controversial)
A 1-day view window means: if someone sees your ad without clicking and then converts within 24 hours, that conversion gets credited to your ad.
View-through attribution is controversial because it attributes credit to an ad that the user may barely have noticed. Someone who scrolled past your ad in their feed, ignored it, and then bought your product because they already wanted it would still be counted as a view-through conversion.
This means 1-day view attribution tends to inflate your reported conversion numbers. You will see a higher reported ROAS, but the ad may not have caused those conversions — the user was already going to buy.
View attribution is most defensible for brand awareness campaigns and retargeting — situations where you are genuinely influencing purchase decisions with visual exposure. It is least reliable for broad cold traffic campaigns where most conversions would have happened anyway.
The Old vs New Default: What Changed After iOS 14
Before iOS 14, Meta’s default was 28-day click + 1-day view. This long window captured conversions that happened up to 4 weeks after clicking an ad. After iOS 14 made user-level tracking difficult for opted-out users, Meta shortened the default to 7-day click + 1-day view.
The change matters for two reasons:
- If you are comparing current campaigns to pre-2021 campaigns, the numbers are not directly comparable
- Products with long consideration periods such as furniture, B2B services, or high-ticket items lost a significant chunk of attributable conversions under the shorter window
You can still select 1-day click as a more conservative option if you want a stricter, cleaner measure of ad impact with less modelling uncertainty.
Which Attribution Window Should You Use?
| Business Type | Recommended Window | Why |
|---|---|---|
| Impulse-buy ecommerce (under £30) | 1-day click | Purchases happen quickly; short window reflects true impact |
| Mid-ticket ecommerce (£30–£200) | 7-day click | Buyers research for a few days before deciding |
| High-ticket or considered purchases | 7-day click + 1-day view | Long consideration period; view exposure matters |
| Lead generation | 7-day click | Form fills happen within days of ad exposure |
| Retargeting campaigns | 7-day click + 1-day view | View-through attribution makes sense for warm audiences |
| Brand awareness | 1-day view | Measuring awareness lift, not direct response |
How to Change Your Attribution Settings in Meta Ads Manager
Attribution settings in Meta are set at the ad set level, not the account level. Here is how to change them:
- Go to Ads Manager and open the campaign you want to edit
- Click into the Ad Set
- Scroll to the Conversion section
- Find Attribution Setting and click the dropdown
- Select your preferred window
- Save and publish
Important: changing the attribution window on a live ad set resets the learning phase. Avoid making this change during peak periods or shortly after launching a new campaign. Wait until the ad set has exited the learning phase before adjusting the window.
You can also view historical data under different attribution windows without changing your active settings. In Ads Manager, use the Columns → Customise Columns option, or use the Attribution Settings breakdown to compare windows side by side in reporting.
Attribution vs Aggregated Event Measurement: What Is the Difference?
Attribution windows and Aggregated Event Measurement (AEM) are two different systems that are often confused:
- Attribution settings determine which time window Meta uses to credit conversions to your ads
- AEM determines how Meta measures conversions for opted-out iOS users using modelled, aggregate data
AEM operates within your attribution window — it still respects the 7-day click or 1-day view limits you set. AEM does not extend your window; it improves the accuracy of what is measured within it for iOS users. You need both correctly configured for accurate campaign reporting.
How Attribution Settings Affect Campaign Optimisation
Meta’s algorithm uses your attribution window to decide which ad delivery patterns produce the most conversions. If you are using a 1-day click window, the algorithm will prioritise showing ads to people who are highly likely to buy within 24 hours — which tends to favour people already deep in the funnel.
A 7-day click window gives the algorithm more flexibility. It can serve ads earlier in the customer journey and still get credit for the eventual conversion, which often produces better results for cold traffic campaigns.
This is the key insight: your attribution window is part of your bidding strategy, not just a reporting choice. A 7-day window actively shapes which users Meta targets with your ads. Run a tracking audit regularly to make sure your conversion data is clean enough for the algorithm to work correctly.
Common Attribution Misconceptions
A longer window means better ROAS
A longer window reports more conversions, but those conversions may have happened without your ad. The reported ROAS goes up, but the actual return may not. For accurate measurement, use the shortest window that still captures your real customer journey.
Attribution settings only affect reporting
False. Attribution settings actively affect which users Meta targets and how it optimises delivery. This is why changing windows mid-campaign is disruptive — it restarts the learning phase and can temporarily reduce performance.
My Meta conversions should match my store orders
Meta’s click and view attribution will almost always show more conversions than your store’s actual orders for the same period. This is because multiple ads can each take credit for the same conversion. Your store reports one order; Meta may attribute it to several different campaigns. This is normal — use your actual store revenue as the source of truth, and use Meta’s attribution data to understand relative performance between campaigns, not as an absolute revenue figure.
Reviewing your Facebook pixel audit results alongside your attribution settings gives you the clearest picture of whether your data is accurate enough to trust for bidding decisions.
Related Articles
- How to Audit Your Facebook Pixel in 5 Minutes
- Meta Aggregated Event Measurement: What It Is and How to Set It Up
- Tracking Explained: How Every Ad Platform Tracks Your Ads
- Free Tracking Audit Checklist: Is Your Setup Working?
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