What's a typical default attribution window?

Varies by platform, but 30 days for clicks and 1 day for views is a common default on many platforms, though this can and often should be customised based on a business's actual typical time-to-conversion.

Can attribution window length affect automated bidding?

Yes, since bidding algorithms learn from whichever conversions fall within the configured window, a too-short window can mean the algorithm is trained on an incomplete, misleadingly narrow picture of what's actually converting.

Should click and view windows always be different lengths?

Commonly yes, since a click represents active engagement while a view represents passive exposure, many businesses set a longer window for clicks and a notably shorter one for views to reflect that difference in influence.

How do I know if my attribution window is too short?

Compare your typical customer's actual time-to-conversion (from first ad interaction to purchase) against your configured window, if a meaningful share of real customers convert after the window closes, it's likely too short.

Does a longer attribution window always give a more accurate picture?

Not necessarily, an excessively long window risks crediting ads for conversions that would have happened anyway due to unrelated factors, the goal is matching the window to the business's real decision cycle, not simply maximizing its length.

What Is an Attribution Window?

An attribution window is the length of time after an ad interaction, a click or a view, during which a resulting conversion will still be credited back to that ad. If a conversion happens after the window has closed, it won't be attributed to that specific ad interaction at all, even if the ad genuinely influenced the eventual decision.

How Attribution Windows Work

Attribution windows are typically configured separately for clicks and views, and often set to different default lengths, a common setup might credit a conversion to a click within 30 days, but only to a view (an ad seen but not clicked) within 1 day, reflecting the reasonable assumption that a view alone carries a weaker, more short-lived influence than an active click.

The window length directly shapes what gets counted as a conversion for that ad, a short window will miss genuine conversions that happen after a longer consideration period, understating the ad's true impact, while an unnecessarily long window can over-credit an ad for a conversion that may have happened anyway, influenced by other factors entirely unrelated to that specific ad interaction.

Examples & Use Cases Attribution Window

A fast-moving consumer goods brand sets a 7-day click attribution window, reflecting typically short purchase decisions, a conversion happening 10 days after a click wouldn't be credited to that ad under this setup.
A B2B software company with a typically 60-90 day sales cycle sets a 90-day click attribution window specifically to avoid understating ad impact for its naturally longer consideration period.
An advertiser compares performance under a 7-day window versus a 30-day window for the same campaign and finds the 30-day window shows meaningfully more conversions, revealing that a longer window better reflects its actual, longer customer decision cycle.
A subscription business testing a new acquisition channel deliberately waits a full attribution window cycle before judging its performance, avoiding a premature verdict based on conversions that simply hadn't had time to occur yet.

Calculation of Attribution Window

An attribution window itself isn't calculated, it's a configured setting (commonly ranging from 1 to 90 days depending on platform and business type). Its effect on reported conversions can be measured by comparing total attributed conversions for the identical underlying data under two different window lengths.

Attribution window is closely related to, but distinct from, attribution model, the window determines the time boundary within which a touchpoint can even be considered eligible for credit; the model, whether last-click or a distributed alternative, then determines how credit is distributed among whichever touch points fall within that window. A touchpoint outside the window isn't included in the model's calculation at all, regardless of which model is being applied.

How to Interpret Attribution Window

The right attribution window should be set based on a business's actual, typical time-to-conversion, not an arbitrary platform default. Reviewing the actual distribution of time-to-conversion across recent customers, and setting the window to capture the bulk of that distribution without extending so far that unrelated later actions get miscredited, is the most defensible way to choose window length.

Why Attribution Window Matters

A mismatched attribution window, too short for the business's real sales cycle, can make ads look far less effective than they actually are, since genuine conversions occurring after the window closes simply go unattributed and effectively disappear from reporting. Setting the window correctly is a prerequisite for attribution and bidding data actually reflecting reality.

Frequently Asked Questions

What's a typical default attribution window?: Varies by platform, but 30 days for clicks and 1 day for views is a common default on many platforms, though this can and often should be customised based on a business's actual typical time-to-conversion.
Can attribution window length affect automated bidding?: Yes, since bidding algorithms learn from whichever conversions fall within the configured window, a too-short window can mean the algorithm is trained on an incomplete, misleadingly narrow picture of what's actually converting.
Should click and view windows always be different lengths?: Commonly yes, since a click represents active engagement while a view represents passive exposure, many businesses set a longer window for clicks and a notably shorter one for views to reflect that difference in influence.
How do I know if my attribution window is too short?: Compare your typical customer's actual time-to-conversion (from first ad interaction to purchase) against your configured window, if a meaningful share of real customers convert after the window closes, it's likely too short.
Does a longer attribution window always give a more accurate picture?: Not necessarily, an excessively long window risks crediting ads for conversions that would have happened anyway due to unrelated factors, the goal is matching the window to the business's real decision cycle, not simply maximizing its length.

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