Meta attribution windows: 7-day click vs 1-day, and which to trust

7-day click attribution captures more conversions and flatters your ROAS, while 1-day click is stricter and closer to what happened right after the click. Neither is the truth on its own. Choose the window that matches your buying cycle, then always reconcile Meta's reported number against your actual store revenue before you make a budget decision on it.

What an attribution window actually is

An attribution window is the period after someone sees or clicks your ad during which a later purchase still gets credited to that ad. A 7-day click window credits a purchase made up to a week after the click. A shorter window credits fewer of them. So the same campaign will report a higher ROAS on a longer window purely because it is counting more of the delayed sales, not because it performed better.

7-day click vs 1-day click vs 1-day view

7-day click is the most generous of the common settings and is Meta's usual default. 1-day click only credits purchases made within a day of the click, which is stricter and steadier. View-through credit, where someone saw but did not click, is the softest signal of all and should be read with caution because it claims sales the click never touched. The more generous the window, the better the ad looks and the further it drifts from cause and effect.

Which window to pick

Match the window to how long your customers actually take to buy. A low-priced impulse product is bought fast, so a short click window tells you most of the story and keeps you honest. A considered, higher-priced purchase genuinely takes days, so a 7-day click window is fairer to the ad that started the journey. Pick the window that reflects your real buying cycle and then keep it consistent, because switching windows mid-analysis just moves the goalposts.

Why platform ROAS overstates, and MER corrects it

Every attribution window credits the platform for sales it influenced but did not solely cause, which is why platform ROAS almost always reads higher than the business actually earned. The correction is to watch marketing efficiency ratio and blended acquisition cost, which use real total revenue and total spend and do not care about the window. See ROAS vs MER vs blended CAC and why blended CAC hides your real acquisition cost.

Reconcile, do not trust blindly

Use the platform number to compare ads against each other on the same window, and use blended, revenue-based numbers to judge whether the whole account is actually profitable. When the two disagree badly, trust the store. AdScale reconciles what Meta reports against your real account totals and tells you plainly when a number cannot be trusted, instead of letting a flattering window drive a spend decision.