Attribution windows control how long a click gets credit for a conversion. A visitor clicks your Facebook ad today, signs up tomorrow—does the ad get credit? That depends on your window setting.
Most platforms default to 7-day click attribution. Google Ads, Facebook Ads Manager, and analytics tools treat this as the standard. But 1-day and 30-day windows exist for good reasons, and picking the wrong one skews your entire acquisition strategy.
What each window measures
A 1-day click window credits conversions that happen within 24 hours of the click. It favors high-intent traffic—people who click and convert immediately. If you run retargeting ads or promote time-sensitive offers, 1-day attribution isolates fast movers. It also deflates your reported conversion rate, because anyone who takes two days to decide doesn’t count.
A 7-day click window stretches the timeline to a week. This captures people who click, bookmark, think it over, then come back and subscribe or buy. Most B2C purchases and newsletter signups fall inside seven days. It’s why this is the default: it balances immediacy with realistic decision cycles.
A 30-day click window credits conversions up to a month after the click. This favors long consideration cycles—B2B SaaS trials, high-ticket courses, consulting services. If your average customer reads three blog posts and downloads a lead magnet before buying, 30-day windows give you a fuller picture. The downside: they inflate attribution for channels that generate early awareness but don’t close the sale.
When short windows hide channel value
If you run cold traffic campaigns—SEO blog posts, YouTube tutorials, LinkedIn thought leadership—1-day windows will make those channels look terrible. Someone discovers your site via Google, reads two posts, subscribes to your newsletter three days later. A 1-day window credits nothing. A 7-day window credits the blog post. A 30-day window credits it plus any other touchpoint in the prior month.
This is why content marketers and SEO operators prefer longer windows. Content rarely converts same-day. If you judge an SEO article by 1-day attribution, you’ll kill posts that actually seed your funnel.
Conversely, if you run retargeting ads or flash sales, 7-day and 30-day windows give credit to clicks that didn’t matter. Someone clicked your carousel ad two weeks ago, forgot about it, then found you via organic search and subscribed. The 30-day window credits the ad. The 1-day window credits nothing, because the real driver was search.
Platform defaults and where they diverge
Google Ads defaults to 30-day click attribution for conversions. Facebook Ads Manager defaults to 7-day click, 1-day view. Google Analytics 4 lets you set attribution windows per conversion event, but defaults to 90 days for some goals and 30 for others, depending on how you configured them.
If you’re comparing Facebook CPM to Google Search CPC, and Facebook reports conversions on a 7-day window while Google uses 30, you’re not comparing the same metric. Facebook looks cheaper because fewer conversions qualify. Normalize the windows before you shift budget.
Stripe and payment processors don’t use attribution windows—they timestamp purchases. If you’re reconciling ad spend to revenue, you need to apply the window logic yourself. Export clicks by date, exports conversions by date, match them within your chosen window, then calculate cost per acquisition. Most operators skip this step and wonder why dashboard revenue doesn’t match bank deposits.
How to pick your window
Start with your median time-to-conversion. If 80% of your newsletter subscribers sign up within 48 hours of first visit, a 7-day window is fine. If 60% of your course buyers take two weeks to decide, use 30 days.
Run a simple query: pull your conversion events (signups, purchases, trial starts) and join them to first-touch timestamps. Calculate the gap. If the 75th percentile is under seven days, a 7-day window won’t lose much signal. If it’s over two weeks, you need 30.
For operators running multiple channels, set different windows per channel in your spreadsheet or BI tool, even if the platform won’t let you. Tag SEO traffic with a 30-day window, tag retargeting with 1-day, then compare them honestly. You’ll stop over-investing in channels that look good under long windows but don’t actually close.
One more thing: if you change your attribution window mid-campaign, your before/after metrics aren’t comparable. Conversion rate, CPA, and ROAS all shift when you change the counting rule. Document the switch, split your reporting periods, and don’t blend the data.
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