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How is e-commerce conversion rate calculated and why is it often misread?
E-commerce conversion rate is the number of orders divided by the number of sessions (or visitors) in the same period, multiplied by 100. If 2,000 sessions produce 50 orders, the conversion rate is 2.5 percent. It shows how effectively traffic turns into purchases.
It matters because it separates two problems: not enough traffic and traffic that does not buy.
Commonly misread:
- Comparing sessions-based and visitors-based rates as if they were the same.
- Looking only at the site-wide figure, when mobile, desktop, source and landing page can differ widely.
- Ignoring that a campaign bringing cheap, low-intent traffic lowers the rate without harming profit.
- Comparing against someone else's published rate; products, prices and traffic mix make that unreliable.
Track your own rate by device and traffic source over time, and pair it with average order value and margin.
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