Attribution Window (Social)

The time window after a social ad click during which a conversion is credited to that ad. Typically ranges from 1 to 28 days depending on platform.

Also known as: conversion window lookback window attribution period conversion attribution window social attribution period

What is an Attribution Window?

An attribution window is the period of time after a user clicks a social media ad during which any subsequent conversion (purchase, sign-up, download, etc.) is credited to that ad. It essentially defines how far back in the customer journey a platform will look to assign credit for a conversion.

For example, if your attribution window is set to 7 days, a user who clicks your Facebook ad on Monday and completes a purchase on Friday will be counted as a conversion from that ad. If they purchase the following Tuesday (8 days later), that conversion won't be attributed.

Common Attribution Windows by Platform

Meta (Facebook & Instagram): Typically 1, 7, or 28-day windows. The 28-day window is the default, though many UK advertisers use 7-day for faster feedback.

TikTok: Offers 1, 7, and 30-day attribution windows. Shorter windows can help identify high-intent users.

LinkedIn: Generally 1, 7, or 30-day options, important for B2B campaigns popular with UK enterprise clients.

Twitter/X: Usually 1, 14, or 30-day windows depending on campaign objectives.

Why Attribution Windows Matter

Attribution windows directly impact how you measure campaign performance and ROI. A longer window captures more conversions but may misattribute sales that were driven by other factors. A shorter window provides faster, more accurate feedback but might undercount true campaign impact, especially for products with longer consideration cycles.

For UK e-commerce, financial services, and SaaS companies, choosing the right window is crucial. A luxury goods retailer might use a 28-day window since purchase decisions take longer, while a fast-moving consumer goods company might prefer 7 days.

Best Practices

Match your window to buyer journey: Consider your average time from first touch to purchase. Most UK B2C brands see good results with 7-day windows; B2B often requires 14 or 28 days.

Test and compare: Run campaigns with different windows simultaneously to identify what drives genuine ROI in your market.

Account for seasonality: During peak trading periods (Black Friday, Christmas), longer windows can capture seasonal intent patterns.

Monitor platform changes: iOS privacy updates have made shorter, more conservative attribution windows increasingly common and reliable.

Use cross-platform data: Don't rely solely on platform attribution; integrate with your analytics to validate which window genuinely reflects customer behaviour.

Understanding attribution windows helps Connect Media Group's clients avoid overestimating campaign performance and ensure budget is allocated to the channels and strategies that genuinely drive conversions.

Frequently Asked Questions

What's the difference between a 7-day and 28-day attribution window?

A 7-day window attributes conversions only if they occur within 7 days of the ad click, providing faster, more conservative performance data. A 28-day window captures conversions up to 28 days later, showing more total conversions but potentially crediting sales influenced by other factors. Choose based on your typical customer purchase timeline.

Should I use the same attribution window across all my social channels?

Not necessarily. Different platforms and audiences may warrant different windows. E-commerce might use 7 days, while lead generation or B2B campaigns often need 14-28 days. Test to find what aligns with your actual customer journey data.

How does iOS privacy affect attribution windows?

Apple's privacy changes made longer attribution windows less reliable on Meta platforms. Many UK advertisers now favour shorter windows (1-7 days) where data is more accurate, though this means accepting potential undercount of true campaign impact.

Can I change my attribution window after a campaign starts?

Yes, but it's not recommended mid-campaign as it will change how historical data is reported. Set your window before launch based on your expected customer journey, then analyse data with that window consistent throughout the campaign.

Learn How to Apply This

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