Each stage rate is the next stage's count divided by the previous stage's count.
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An ecommerce conversion funnel calculator breaks a single blended conversion rate into the individual stages a shopper passes through, from landing on the site to adding a product to cart, starting checkout, and completing a purchase. Seeing each stage separately makes it obvious where shoppers are actually dropping off.
A 4% overall conversion rate could mean shoppers are barely adding anything to cart, or it could mean carts are full but checkout is broken, and those are completely different problems with completely different fixes. Breaking the funnel into stages shows which specific step is losing the most shoppers relative to the step before it.
The cart-to-checkout and checkout-to-purchase stages tend to see the sharpest single-step drop-offs, often tied to unexpected shipping costs, a slow or confusing checkout flow, or forced account creation. Tracking your own cart abandonment rate alongside this funnel view helps confirm exactly which step deserves attention first.
Once you know which stage has the weakest rate, that is the stage to test changes against, whether that means simplifying checkout fields, adding trust signals near the cart, or clarifying shipping costs earlier in the flow. Re-running this calculator after each change gives you a clean before-and-after comparison, and pairing it with your average order value shows the revenue impact of fixing each stage.
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