Google Ads Attribution Windows Explained

A Google Ads conversion window is the number of days after an ad click or view during which Google Ads will still credit a conversion to that interaction — once that window closes, a real conversion that happens outside it is never recorded at all.

This is one of the quieter causes of “missing” conversions, because nothing looks broken — the conversion simply never gets counted in the first place.

The short version: Google Ads' default conversion windows are 30 days for click-through, 3 days for engaged-view, and 1 day for view-through interactions — a conversion that happens after the relevant window closes is permanently excluded from your reporting, not delayed, and adjusting the window only affects future conversions, never ones that already fell outside the old one.

Key Takeaways

Google Ads' default conversion windows are 30 days (click-through), 3 days (engaged-view), and 1 day (view-through) — different interaction types get different windows.
A conversion outside the window isn't delayed or queued — it's simply never recorded, with no error or notification.
Changing a conversion window only affects future conversions; it never retroactively recounts conversions that already fell outside the previous window.
A long sales cycle — B2B quote requests, high-consideration purchases — is the most common reason a business needs a longer-than-default conversion window.
Data-driven attribution is Google Ads' default attribution model for most conversion actions, distributing credit across contributing touchpoints instead of just the last click.

What a Conversion Window Actually Controls

A conversion window answers a specific question: how long after someone clicks or views an ad should Google Ads still credit that ad if they convert? See About conversion windows for how Google Ads defines and applies it.

This is a different setting from the attribution model, which decides how credit is split across multiple touchpoints. A conversion window decides whether a touchpoint is even eligible to receive credit in the first place — the model only matters after that.

The Three Default Windows You're Working With

Google Ads uses three separate default windows depending on the interaction type: 30 days for click-through conversions, 3 days for engaged-view conversions, and 1 day for view-through conversions. Each measures a different kind of ad interaction, and each runs on its own clock.

Three clock dials of different sizes representing three different conversion window lengths

Most accounts never touch these settings, which is fine for a short, straightforward path from ad to purchase. The problems start when the sales cycle doesn't match the default.

Why Conversions Outside the Window Just Disappear

This is the part that surprises people: a conversion window isn't a queue. If someone clicks an ad and converts on day 35 with a 30-day window in place, Google Ads doesn't record that conversion five days late — it doesn't record it at all.

There's no error, no flag, no notification. The conversion happened, the customer is real, and it simply never appears in Google Ads' reporting for that campaign.

When a Longer Sales Cycle Needs a Longer Window

B2B services, high-consideration purchases, and anything involving a quote-and-follow-up process regularly take longer than 30 days from first ad click to closed deal. If your actual sales cycle runs longer than your conversion window, a meaningful share of real conversions are being silently excluded.

Timeline extending past a window boundary line with a conversion event fading just beyond it

Widening the window is a straightforward change in each conversion action's settings, but it only changes what counts going forward — it can't recover conversions that already happened outside the old window.

How Attribution Models Fit Into This (and Why They're a Different Setting)

Once a conversion is inside the window and eligible to be counted, the attribution model decides how credit for that conversion gets distributed across the touchpoints that led to it. See About data-driven attribution for how Google Ads' default model works.

Touchpoint icons connected with varying line thickness showing weighted attribution credit

Data-driven attribution is the default for most conversion actions, and it uses your account's own data to weigh each interaction's actual contribution rather than crediting only the first or last click. A conversion window problem and an attribution model question can look similar from a distance, but they're solving different problems.

How to Tell a Window Problem From a Real Tracking Bug

A conversion window issue has a specific signature: conversions look accurate for interactions close to the click, but seem to thin out the further back you look — especially for a longer, considered purchase. A real tracking bug usually looks different: conversions missing across the board regardless of timing, or numbers that don't recover even after widening the window.

Side-by-side comparison of a gradually fading conversion pattern versus randomly missing conversions

If you've ruled out the window as the cause, the mismatch is more likely a setup issue elsewhere. For a broader breakdown of common Google Ads tracking mistakes, see Why Your Google Ads Conversion Numbers Might Be Wrong.

Checking and Adjusting Your Conversion Window

In Google Ads, conversion window settings live on each individual conversion action, not as a single account-wide setting — a purchase conversion and a lead-form conversion can have entirely different windows.

Settings panel with a duration slider being actively adjusted

Review the window on each conversion action against how long your actual sales cycle runs for that specific action, rather than applying one assumption across the whole account.

Quick Reference: Conversion Window Checklist

Know your actual sales cycle length for each conversion action, not an assumption.
Check whether your click-through window (default 30 days) comfortably covers that cycle.
Remember view-through (1 day) and engaged-view (3 days) windows are much shorter than click-through by default.
Understand that widening a window only affects future conversions, not past ones.
Separate a window problem (conversions thin out over time) from a real tracking bug (conversions missing regardless of timing).

Not Sure If It's a Window Problem or a Tracking Problem?

A conversion tracking audit reviews your conversion window settings alongside the rest of your setup, so you know exactly what's costing you real conversions.

Frequently Asked Questions

What is a Google Ads conversion window?

It's the number of days after an ad click or view during which Google Ads will still credit a conversion to that interaction. Conversions happening after the window closes for that interaction type simply aren't recorded.

What's the default conversion window in Google Ads?

30 days for click-through conversions, 3 days for engaged-view conversions, and 1 day for view-through conversions — three separate defaults depending on the type of ad interaction.

Does widening my conversion window recover past conversions?

No. A window change only applies going forward. Conversions that already fell outside the previous window are not retroactively recounted.

What's the difference between a conversion window and an attribution model?

The conversion window decides whether an interaction is even eligible to be credited at all. The attribution model, which only applies to interactions already inside the window, decides how credit for a conversion is distributed across the touchpoints that led to it.

Can different conversion actions have different windows?

Yes. Conversion window settings live on each individual conversion action, so a purchase and a lead-form submission can use entirely different windows within the same account.

How do I know if I should extend my conversion window?

Compare your actual sales cycle length — from first ad interaction to closed conversion — against your current window. If your real cycle regularly runs longer than the window, you're likely losing real conversions silently.