Conversion rate

The share of a starting group that completes an action: numerator over denominator, both defined for the same people and period.

FormulaConversion = people who did X ÷ people who could

Try it · 30 seconds · from Atterna’s practice

An AI assistant

“Your conversion rate is 52%.”

On Meridian, 52% of registered buyers paid at least once in three weeks, and 4.2% of visits ended in an order. Which is the conversion rate?

Preparing the practice…

How we work it through

1
Write the denominator first: visits, visitors or registered users.
2
Keep numerator and denominator in the same period and the same population.
3
When two conversions disagree, compare their denominators before anything else.

On the practice dataset

The query we run on Meridian, Atterna’s practice marketplace, and what it returns.

SELECT (SELECT COUNT(*) FROM meridian.visit_orders) * 1.0
       / COUNT(*) AS visit_to_order
FROM meridian.visits;

Result4.2% of 195,013 visits end in an order; 52% of registered buyers paid in the three weeks of orders — both called “conversion”

The common trap

An unstated denominator. The same word can mean per visit, per visitor or per registered user.

ExampleOn Meridian, 52% of registered buyers paid at least once in the three weeks of orders, while 4.2% of visits in the funnel extract ended in an order. Both are “conversion”.

When an AI answers