What is conversion rate? Definition, formula and example
Conversion rate is the percentage of visits, or visitors, that complete a desired action, most often a purchase. It is conversions divided by the total number of visits or visitors, multiplied by 100.
How to calculate it
Conversion rate = conversions ÷ total visits (or users) × 100.
Hypothetical example: a store receives 10,000 sessions in a month and 200 of them end in an order. Its conversion rate is 200 ÷ 10,000 = 2%.
What goes in the denominator depends on the tool:
- Google Analytics 4 reports a session key event rate (sessions in which a key event happened ÷ all sessions) and a user key event rate (users who completed a key event ÷ all users). The same store can show two different conversion rates depending on which one you pick.
- Google Ads divides conversions by the ad interactions that can be tracked to a conversion. Google gives the example of 50 conversions from 1,000 interactions, a 5% rate, and notes the rate can exceed 100% when every conversion is counted, because one interaction can lead to several.
Why it matters
Conversion rate multiplies everything else. Revenue is roughly traffic × conversion rate × average order value, so moving from 2% to 2.5% on the same traffic means 25% more orders. That is why stores study the conversion funnel to find the step where most shoppers drop out, and why checkout problems that drive cart abandonment get so much attention.
Common mistakes
- Comparing unlike rates. Session-based and user-based rates are not interchangeable, and neither matches an ad platform's click-based rate.
- Chasing benchmarks. Rates vary widely by category, price point, device and traffic source. Your own trend over time is a better yardstick.
- Ignoring measurement gaps. If tracking is blocked or consent is declined, conversions go unrecorded and the rate looks lower than it is.
- Optimizing the rate, not the business. A deep discount can raise conversion rate while cutting margin.
CIQRA's live dashboard shows revenue, orders, conversion and average order value on one screen.