What is conversion rate? Definition, formula and examples
Conversion rate is the share of visitors or sessions that complete a goal: conversions ÷ visitors × 100. Formula, worked example, GA4 key event rates and FAQ.
Conversion rate is the percentage of visitors, sessions or clicks that complete a goal you have defined, such as a purchase, a sign-up or an enquiry. The formula is conversions ÷ the number of people or visits that had the chance to convert × 100. If 2,000 sessions produce 40 enquiries, the conversion rate is 2%. Always say which goal and which denominator you used: a rate per session, per user and per ad click are three different numbers.
How to calculate conversion rate in 3 steps
Choose the goal and the denominator. Write down the exact outcome (a completed order, not an add-to-cart) and the base that had the chance to complete it: sessions, users or ad clicks. Keep that pair fixed for every comparison.
Apply the formula. Conversion rate = conversions ÷ denominator × 100. Use counts from the same report, date range and segment, and keep the raw counts beside the percentage so readers can see how much evidence it rests on.
Decide how repeats count. If one visit can produce several outcomes, the number of outcomes divided by sessions is an event ratio, not the share of sessions that converted. For the share, count sessions or users with at least one outcome.
Conversion rate formulas by denominator
The same word covers several calculations. Pick the row that matches your question and name it in the report.
| Rate | Formula | Answers |
|---|---|---|
| Session conversion rate | Sessions with a conversion ÷ sessions × 100 | How often a visit ends in the goal |
| User conversion rate | Users who converted ÷ users × 100 | What share of people complete the goal |
| Click conversion rate (ads) | Conversions ÷ ad clicks × 100 | How often a paid click leads to the goal |
| GA4 session key event rate | Sessions with a key event ÷ sessions | GA4’s session-based conversion rate |
| GA4 user key event rate | Users with a key event ÷ total users | GA4’s user-based conversion rate |
Conversion rate worked example
The figures are invented to show the calculation; they are not a benchmark. An online shop looks at one month of data.
| Input | Number |
|---|---|
| Sessions | 10,000 |
| Users | 7,500 |
| Orders | 260 |
| Sessions with at least one order | 240 |
| Users who ordered | 220 |
Orders ÷ sessions = 2.6%, an event ratio. Sessions with an order ÷ sessions = 2.4%, the session conversion rate. Users who ordered ÷ users = 2.9%, the user conversion rate. All three are correct; they answer different questions, so a report has to say which one it shows. Try your own numbers in the free conversion-rate calculator in the tools collection.
Same data, two conversion rates
A landing page’s conversion rate rises from 2% to 3% in a month. Before celebrating, check the denominator: if a paid campaign that sent low-intent visitors was paused, the rate can rise while total conversions stay flat or fall. Report the rate with the conversion count and the traffic mix.
What to keep in mind
A conversion rate is only as meaningful as its goal and denominator. Rates calculated per session, per user or per click are not interchangeable, and a higher rate can come from losing low-intent traffic rather than improving the page. There is no universal good conversion rate: it depends on the goal, price, audience and traffic source, so compare a page with its own history and with similar pages.
Conversion rate: common questions
What is the formula for conversion rate?
Conversion rate = conversions ÷ total visitors (or sessions, or clicks) × 100. For example, 50 sign-ups from 2,500 sessions is 50 ÷ 2,500 × 100 = 2%.
What is a good conversion rate?
There is no single good figure. It varies with the goal (a newsletter sign-up converts far more often than a high-price purchase), the traffic source and the audience. The useful comparison is a page against its own past performance and against similar pages on the same site.
What is conversion rate in GA4?
GA4 calls conversions key events. It reports session key event rate (sessions with a key event divided by sessions) and user key event rate (users who triggered a key event divided by total users). Which events count depends on what you marked as key events in the property.
Is conversion rate the same as click-through rate?
No. Click-through rate is clicks divided by impressions and measures response to a search result or ad. Conversion rate measures what happens after the click: the share of visits or people that complete a goal.
Should I use sessions or users for conversion rate?
Use sessions when the question is about visits, such as how well a landing page converts on arrival. Use users when the question is about people, such as what share of visitors eventually buy. Keep the same choice when comparing periods.
Your next useful step.
Write down your main goal and its denominator, then calculate the rate per landing page for the last 28 complete days with the conversion counts alongside. LiftSEO can pull those GA4 numbers for you and keep the definition next to every rate.
Working with this in LiftSEO
A metric needs a numerator, denominator, reporting period and source. Record those alongside the result. The examples in these notes are invented to explain the calculation; they are not industry benchmarks or LiftSEO customer results.
Explore the workspaceSources & context
This note combines original practical guidance with the reporting references below. Follow provider documentation for current definitions and availability; suggested investigations are not guarantees of a particular result.