What is Cart Abandonment Rate?
Cart Abandonment Rate is the percentage of online shoppers who add items to their cart but leave without completing the purchase. It is one of the clearest signals of friction somewhere between browsing and checkout.
TL;DR
Cart abandonment rate is the share of shoppers who added items to their cart but never finished checking out, and it's usually much higher than store owners expect.
Formula
Cart Abandonment Rate = (Carts Not Completed / Carts Created) × 100
Why It Matters
Cart abandonment rate matters because it isolates one of the most fixable revenue leaks in ecommerce: shoppers who already showed strong intent by adding a product to their cart, then dropped off before paying. It matters because those shoppers are far easier to win back than someone who never engaged at all, so a high abandonment rate represents recoverable revenue sitting in plain sight rather than a demand problem. Ignoring it means leaving retargeting emails, checkout simplification, and other low-cost fixes on the table while continuing to spend on new traffic to replace the revenue that's actually just stuck at checkout. It also serves as an early warning for checkout-specific friction, like unexpected shipping costs or a clunky payment form, that wouldn't show up in broader conversion rate numbers. Because the fixes for cart abandonment are typically cheap relative to acquiring new traffic, it's one of the highest-leverage metrics for a store to actively work on improving.
Example
An ecommerce store sees 2,000 carts created in a week, and 1,500 of them never reach a completed checkout. Abandonment rate is 1,500 divided by 2,000, times 100, which equals 75%, a figure close to typical industry averages that often surprise store owners who assume most abandoned carts are unusual. Retargeting emails sent within a few hours of abandonment, simplified checkout forms, and showing shipping costs earlier in the flow are the most common levers used to bring that percentage down without changing the product or price at all.
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