Conversion rate is the king of e-commerce metrics. Understanding how to calculate and optimize it is essential for improving your online store profitability and maximizing your marketing return on investment.

The conversion rate is a metric that measures the percentage of visitors who complete a desired action on your site. In e-commerce, this typically means the percentage of visitors who make a purchase.
The basic formula is simple:
Conversion Rate = (Number of Conversions / Number of Visitors) x 100
For example, if your site receives 10,000 visitors per month and generates 200 sales, your conversion rate is 2%.
Conversion rate can measure different actions depending on your goals:
Tracking these different rates helps identify exactly where visitors abandon the purchase process.
Conversion rate calculation varies depending on what you want to measure. Here are the main methods:
This is the most common metric. It measures the percentage of sessions resulting in a purchase:
Overall CR = (Number of Transactions / Number of Sessions) x 100
Note: use sessions rather than unique visitors for more accurate calculations.
Analyze performance by acquisition channel:
This segmentation reveals which channels generate the most qualified traffic.
Compare mobile vs desktop performance. Mobile conversion rate is often 2-3 times lower than desktop, indicating mobile experience needs optimization.
Measure conversion at each stage:
Identifying stages where you lose the most customers helps prioritize optimizations.
Conversion rate directly impacts your profitability. Here's why it's a priority metric:
A 0.5 point improvement in your conversion rate can mean thousands of dollars extra. Example: with 100,000 visitors/month and $100 average order value, going from 2% to 2.5% conversion generates $50,000 additional revenue per month.
Improving conversion rate mechanically reduces your customer acquisition cost (CAC). Better conversion means faster ROI on your advertising investments.
Average conversion rates vary by industry:
Rather than comparing to averages, focus on continuous improvement of your own rate. A good conversion rate is one that improves month over month.
Satisfied customers convert better on subsequent visits. Investing in customer experience has a positive long-term effect on your overall conversion rate.
Customer reviews are a powerful lever to improve your conversion rate. Here's how Review Collect boosts your performance:
Our clients see an average 18% increase in conversion rate after integrating reviews on their product pages.
Review Collect's omnichannel approach also enables review collection across all touchpoints to maximize social proof.