Definition
Cart abandonment rate is the percentage of shopping carts that are created but never turned into a completed purchase. It measures how many shoppers add an item, signalling real intent to buy, and then leave before paying.
It is one of the most watched and most recoverable numbers in ecommerce, because a shopper who reached the cart has already done the hard part of deciding they want the product. A high abandonment rate is rarely a demand problem. It is usually a friction problem.
How to calculate cart abandonment rate
The formula is:
Cart abandonment rate = (1 − Completed purchases ÷ Carts created) × 100
For example, a store that creates 8,000 carts and completes 2,400 purchases in a month has an abandonment rate of 70%. You can size both the rate and the revenue behind it with the cart abandonment calculator.
The industry average sits near 70%, based on aggregated research from the Baymard Institute. An abandonment rate meaningfully worse than that usually points at specific, fixable checkout friction rather than your market.
Why cart abandonment rate matters for revenue
Every abandoned cart is a shopper who wanted to buy and hit a wall. The most cited walls are unexpected costs, forced account creation, a long or confusing checkout, and doubt at the payment step. Because these are within your control, much of the abandoned revenue is recoverable, which is what makes the metric so valuable to watch.
There are two ways to act on it, and you need both. Prevention reduces how many carts you lose, by removing the friction that causes abandonment, covered in checkout optimization. Recovery wins back a share of the carts you still lose, with a structured follow-up program, covered in cart abandonment recovery.
From a Revenue Intelligence perspective, cart abandonment is one of the largest and most measurable revenue leaks in ecommerce. The volume is high and the causes are fixable, so it usually ranks near the top when leaks are priced and sorted by impact.
Related metrics
Cart abandonment rate is the checkout-stage counterpart to the add-to-cart rate on product pages, and together they feed your overall conversion rate. The pairing is diagnostic: a high add-to-cart rate combined with a high abandonment rate tells you the product page is doing its job and the checkout is where the sale is lost. Average order value then sets how much each abandoned cart was worth.
In short
Cart abandonment rate is one minus the share of carts that convert. The industry average is around 70%, most of it caused by fixable friction rather than weak intent. Prevent what you can at the checkout, recover the rest with follow-up, and treat the abandoned revenue as a large, recoverable leak.