Add to Cart

In GA4, add_to_cart is a recommended e-commerce event that fires when a visitor places a product in their cart. It carries item-scoped parameters — which product, how many, at what price — and marks the first clear signal of purchase intent in the funnel.

Why it matters

Add to cart is the moment browsing turns into buying intent. It sits between a product view and the rest of the funnel — begin checkout and the purchase event. Comparing how many people add to cart against how many actually buy is the cleanest way to see where you're losing customers. A wide gap usually points to a checkout problem, not a product problem.

A concrete example

Say a small homeware shop sees 800 add_to_cart events in a week but only 120 purchases. That 85% drop-off sounds disastrous. But when you look closer, most carts are abandoned at the shipping-cost step. The product is fine; the surprise postage fee is the leak. The add-to-cart number didn't tell you that — the gap between it and purchases did.

The common misreading

The mistake is treating add to cart as a near-purchase. It isn't. People add items to compare, to save for later, or simply to see the shipping cost. A high add-to-cart count with low purchases isn't a sign your customers are flaky — it's an invitation to look at every step between the cart and the confirmation page.