Metrics & KPIs

ATC

Add to Cart — the tracked event when a visitor adds an item to their cart. ATC-to-purchase ratio is a powerful diagnostic of checkout friction.

ATC (Add to Cart) is the pixel event that fires when someone adds a product to their cart. The ATC-to-purchase ratio is one of the most actionable checkout diagnostics: a healthy store sees 30-50% of ATCs convert to orders. Below 25% and you have a checkout problem — usually unexpected shipping costs, a required account creation, or a payment method missing.

ATC is also a powerful mid-funnel optimization event on Meta when you don't yet have enough Purchase data. Optimizing for ATC trains the algorithm on higher-intent users than Clicks or ViewContent, without requiring the volume that Purchase optimization needs.

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