What Are Attribution Windows?
An attribution window (sometimes called a lookback window or conversion window) defines the time period after someone interacts with your ad during which any resulting conversion gets credited to that ad. It is one of the most important settings in your ad accounts, yet most marketers never change the defaults.
Here is why that matters. If your attribution window is set to 7 days and a customer clicks your ad, browses your site, thinks about it for 10 days, and then buys — that sale never shows up in your ad reporting. As far as the platform is concerned, the ad did not work. But it did.
For businesses spending $10,000 to $200,000+ per month on paid media, misconfigured attribution windows can hide millions in revenue and lead to catastrophically wrong optimization decisions.
How Attribution Windows Work Across Platforms
Every major ad platform has its own default attribution settings, and they are not the same. This creates a measurement mess when you are running campaigns across multiple channels.
Platform Default Attribution Windows (2026)
| Platform | Default Click Window | Default View Window | Maximum Click Window |
|----------|---------------------|--------------------|--------------------|
| Meta (Facebook/Instagram) | 7 days | 1 day | 7 days |
| Google Ads | 30 days | N/A (YouTube: 30 days) | 90 days |
| TikTok | 7 days | 1 day | 28 days |
| LinkedIn | 30 days | 7 days | 180 days |
| Pinterest | 30 days | 1 day | 60 days |
| Snapchat | 28 days | 1 day | 28 days |
| Microsoft Ads | 30 days | N/A | 90 days |
Notice the inconsistency. If you are comparing Meta performance to Google Ads performance using default settings, you are comparing a 7-day click window against a 30-day click window. Google will naturally report more conversions — not because it performs better, but because it has a longer period to claim credit.
Click-Through vs. View-Through Windows
Attribution windows typically have two components:
Click-through attribution credits conversions that happen after someone clicks your ad. This is the more straightforward measurement — someone clicked, then they converted. View-through attribution credits conversions that happen after someone sees your ad but does not click it. The user saw your display ad, did not click, but later visited your site and converted. The ad gets partial credit.View-through attribution is more controversial because the causal link is weaker. Someone might have converted anyway, regardless of seeing your ad. However, dismissing view-through entirely ignores the real impact of awareness campaigns, especially for display, video, and Connected TV.
Why Default Windows Are Probably Wrong for You
The default attribution window on any platform is set to benefit the platform, not your business. Shorter windows undercount conversions (making you think ads are underperforming), while excessively long windows overcount by claiming credit for conversions that would have happened organically.
The Undercounting Problem
After Meta shortened its default window from 28-day click to 7-day click, many advertisers saw reported conversions drop by 20-40% overnight — even though actual sales had not changed. The ads were still working; the reporting window was just too short to capture the full impact.
This is particularly damaging for:
- High-consideration purchases ($500+) where buyers research for weeks
- B2B products with long sales cycles involving multiple stakeholders
- Subscription services where the signup decision takes time
- Seasonal purchases where someone clicks an ad in October but buys in November
The Overcounting Problem
On the flip side, a 90-day attribution window on Google Ads might credit a conversion to a click that happened three months ago, even though the customer has had dozens of other marketing interactions since then. This inflates reported ROAS and makes you overinvest in channels that are getting undeserved credit.
How to Find Your Ideal Window Length
The right attribution window should match your actual time-to-conversion data. Here is how to find it:
Step 1: Analyze your conversion lag data. In Google Ads, go to Tools > Attribution > Conversion Paths and look at the time lag report. This shows how many days pass between first interaction and conversion. Step 2: Find the 90th percentile. If 90% of your conversions happen within 14 days of the first click, a 14-day window captures the vast majority of your conversion value without excessive overcounting. Step 3: Segment by product or campaign type. Your branded search campaigns might convert in 1-2 days, while your prospecting display campaigns might take 21 days. One window does not fit all. Step 4: Account for offline conversions. If you are importing CRM data or offline sales, make sure your window is long enough to capture those delayed signals.Attribution Window Recommendations by Business Type
Based on our work with clients spending $10K-$200K+ monthly on ads, here are the attribution window settings we typically recommend:
E-Commerce (DTC, Average Order Value Under $200)
| Channel | Click Window | View Window |
|---------|-------------|-------------|
| Meta Ads | 7 days | 1 day |
| Google Search | 14-30 days | N/A |
| Google Shopping | 7-14 days | N/A |
| TikTok | 7 days | 1 day |
| Display/YouTube | 14 days | 1 day |
For lower-AOV e-commerce, the default Meta window is usually fine. Most impulse and semi-impulse purchases happen within a week. The bigger risk is overcounting with long windows on Google.
High-Ticket E-Commerce (AOV $500+)
| Channel | Click Window | View Window |
|---------|-------------|-------------|
| Meta Ads | 7 days (max available) | 1 day |
| Google Search | 30-60 days | N/A |
| Google Shopping | 30 days | N/A |
| Display/YouTube | 30 days | 7 days |
With high-ticket items, the 7-day Meta window will significantly undercount. You need to supplement with server-side tracking or a third-party attribution tool to capture the full conversion timeline.
B2B / SaaS
| Channel | Click Window | View Window |
|---------|-------------|-------------|
| Google Search | 60-90 days | N/A |
| LinkedIn | 90-180 days | 30 days |
| Meta Ads | 7 days | 1 day |
| Display/YouTube | 30-60 days | 7-14 days |
B2B sales cycles are long. A 90-day window on LinkedIn is not unusual when enterprise deals take 3-6 months to close. The challenge is balancing accurate measurement against credit inflation.
Lead Generation
| Channel | Click Window | View Window |
|---------|-------------|-------------|
| Google Search | 30 days | N/A |
| Meta Ads | 7 days | 1 day |
| Microsoft Ads | 30 days | N/A |
| Display | 14-30 days | 1-7 days |
Lead gen sits in the middle. The initial conversion (form fill) happens quickly, but the downstream revenue can take months. We recommend shorter windows for lead tracking and longer windows when optimizing to revenue.
How to Change Attribution Windows
In Meta Ads Manager
- Go to your ad set or campaign settings
- Click "Show more options" under the Optimization section
- Find "Attribution setting"
- Choose between 1-day click, 7-day click, 1-day click + 1-day view, or 7-day click + 1-day view
Note that changing the attribution window only affects reporting, not delivery optimization. Meta's algorithm still uses a broader set of signals to optimize.
In Google Ads
- Go to Tools & Settings > Measurement > Conversions
- Select the conversion action you want to modify
- Click "Edit settings"
- Adjust the "Click-through conversion window" (1-90 days)
- For YouTube/Display, adjust the "View-through conversion window" separately
In Your Attribution Platform
If you are using a third-party attribution tool (like Triple Whale, Northbeam, or Rockerbox), you can typically set custom windows that override the platform defaults. This gives you a consistent measurement framework across all channels.
Advanced Attribution Window Strategies
Strategy 1: Use Different Windows for Different Funnel Stages
Do not apply the same window to prospecting and retargeting campaigns:
- Prospecting campaigns need longer windows because they are introducing your brand to cold audiences. It takes time for those users to convert.
- Retargeting campaigns should use shorter windows because these users are already warm. If they do not convert within a few days of seeing a retargeting ad, the ad probably was not the deciding factor.
Strategy 2: Run Window Comparison Tests
Most platforms let you toggle between different attribution windows in your reporting. Run the same report with 1-day, 7-day, and 28-day windows to see how many incremental conversions each extended period captures.
If extending from 7 days to 28 days only adds 5% more conversions, the shorter window is probably sufficient. If it adds 40%, you are significantly undercounting with the shorter window.
Strategy 3: Align Windows with Your Remarketing Strategy
Your attribution window should be at least as long as your remarketing window. If you are retargeting users for 30 days after they visit your site, but your attribution window is only 7 days, you cannot properly measure the retargeting funnel.
Strategy 4: Account for Attribution Window in Budget Decisions
When comparing channels with different windows, normalize the data. Calculate a "per-day conversion rate" for each window length:
- Channel A: 100 conversions in a 7-day window = 14.3 conversions per day
- Channel B: 150 conversions in a 30-day window = 5 conversions per day
Channel A is actually converting at a much higher daily rate, even though Channel B shows a higher total number.
Common Attribution Window Mistakes
Mistake 1: Comparing Channels with Different Windows
This is the most common error we see. Teams report that Google Ads has a 4x ROAS while Meta has a 2x ROAS, without realizing Google is using a 30-day window and Meta is using a 7-day window. Normalize windows before comparing.
Mistake 2: Never Reviewing the Defaults
Platform defaults change. Meta's 2021 window change caught many advertisers off guard. Review your attribution settings quarterly, especially after major platform updates.
Mistake 3: Using the Same Window for All Campaigns
A branded search campaign and a top-of-funnel video campaign should not have the same attribution window. Segment your windows by campaign type and objective.
Mistake 4: Ignoring View-Through for Awareness Campaigns
If you are running display, video, or CTV campaigns and only measuring click-through attribution, you are missing the majority of those campaigns' impact. Include view-through attribution (with a short window like 1 day) for awareness channels.
Mistake 5: Setting It and Forgetting It
Your ideal attribution window changes as your business grows, your product mix evolves, and your customer behavior shifts. Re-analyze your time-to-conversion data at least quarterly.
How Attribution Windows Interact with Attribution Models
Your attribution window defines when conversions are counted, while your attribution model defines how credit is distributed. These two settings interact:
- Last-click model + short window = Most conservative measurement. Only counts quick conversions and gives all credit to the final click.
- Data-driven model + long window = Most comprehensive measurement. Captures delayed conversions and distributes credit across touchpoints.
- First-click model + long window = Emphasizes the initial discovery touch, which can overvalue top-of-funnel channels.
The combination you choose should reflect your business goals. If you need to justify immediate ROI, use shorter windows with last-click. If you are building a long-term growth engine, use longer windows with data-driven or position-based models.
Measuring What Attribution Windows Miss
No attribution window captures everything. Here are supplementary measurement approaches:
Incrementality testing — Run holdout tests to measure the true lift of your ads, independent of attribution window settings. Marketing mix modeling (MMM) — Use statistical models that correlate marketing spend with business outcomes at an aggregate level, bypassing window limitations entirely. Post-purchase surveys — Ask customers how they heard about you. This qualitative data fills gaps that pixel-based attribution misses. Matched market tests — Compare performance in markets where you run ads versus similar markets where you do not.Getting Your Attribution Windows Right
Attribution windows are not a set-and-forget setting. They require ongoing analysis and adjustment as your business, customers, and the ad platforms themselves evolve.
The stakes are high. A misconfigured attribution window can make a profitable campaign look like a loser, or make a losing campaign look like a winner. When you are spending tens or hundreds of thousands per month on ads, that misattribution translates directly into wasted budget.
If you are unsure whether your attribution windows are properly configured, or if your cross-channel reporting tells conflicting stories, get a free growth audit from Digital Point LLC. We will analyze your current attribution setup, identify gaps, and recommend the exact window configurations for your business and sales cycle.