Click-Through Conversions

A click-through conversion is a conversion that happens after someone clicked your ad, counted inside a time limit called the click-through conversion window. In Google Ads, you set that window on each conversion action. Google's help page says the default is 30 days if you do not customize it, and lets you set it longer or shorter, with the maximum depending on the conversion source (30, 60, or 90 days for Search and Display). If a shopper clicks your ad on the 1st and buys on the 20th, that sale is a click-through conversion, credited back to the click. Meta has the same idea with click windows such as 1-day click or 7-day click. You can see the split in Google Ads reporting, where click-through and view-through conversions can be shown separately, and Meta reports click and view windows as separate columns.

Mechanically, the platform records a click against a person or browser, then watches for a conversion event from that same identity. If the event arrives within the window, the click gets credit. If it arrives afterward, it does not, and changes to the window apply only going forward, not to past conversions, as Google's help page notes. A click is a strong signal: someone chose to engage and landed on your site. That is why click-through conversions are the main number that bidding systems and most reports treat as real performance. Click-through is the stricter path because it needs an actual interaction with the ad, which a person must choose to make, and that makes it harder to inflate.

The window interacts with your bid strategy and reporting. Smart Bidding learns from conversions credited within the window, so a very short window can hide slow-burn conversions from the system, and a very long one can hand credit to clicks that only loosely relate to the purchase. Google suggests windows of at least 7 days for richer data. Click-through conversions also sit beside view-through conversions, which count people who saw an ad without clicking. The two are reported separately, so a campaign's total can mix them if you are not careful with which columns are shown. Remember that the window also controls what your bid strategy thinks has happened. A window shorter than your sales cycle starves the strategy, and one that is much longer credits unrelated clicks.

The mistake is treating a click-through conversion as proof the ad caused the sale. A person who already planned to buy and happened to click your ad on the way counts the same as someone who was persuaded. Branded search is the classic case. Another mistake is setting the window by habit: a 30-day window on an emergency service means a conversion three weeks after a click is probably something else, while a 7-day window on a home renovation will miss real sales. Match the window to how long customers really take to decide. Different conversion actions can use different windows, which is sensible: a phone call might use a short window and a quote request a longer one.

To read it, look at conversions by days to convert, or conversion lag, to see how long after the click your customers finish. If most conversions land within two days, a longer window mostly adds noise. If many arrive after a week, a short window is hiding results and starving bidding of data. This week, pull your conversion lag data for your main conversion action, find the point where 90 percent of conversions have arrived, and set your window slightly beyond it. Keep a note of the change date before comparing periods. Record the date of any window change in a notebook, because reports before and after will not compare cleanly. Be careful when comparing platforms. Google's click-through window and Meta's click windows are separate settings with different options, so two reports can both be right and still disagree about the same sale.