The core formula
If 75 purchases come from 2,500 sessions, the session conversion rate is 3%. If you calculate from unique users instead, the percentage may change. State which denominator is used in reporting.
Worked example
300 conversions ÷ 10,000 visitors = 3%.
How to calculate conversion rate correctly
- Define the conversion event first: purchase, lead, signup or another specific action.
- Choose the traffic denominator that matches your reporting system, such as sessions, users or ad clicks.
- Use conversions and traffic from the same date range and attribution rules.
- Divide conversions by traffic and multiply by 100 to express the result as a percentage.
How to interpret conversion rate
Conversion rate measures how often the selected traffic unit becomes the selected conversion event. A change in the definition of either side can move the rate even when customer behavior has not changed.
Segment by device, channel, landing page and audience when the aggregate rate hides meaningful differences. Read conversion rate together with traffic cost, order value and acquisition cost rather than treating it as a complete performance score.
Common mistakes
- Comparing a session-based rate with a click-based rate.
- Using conversions from a longer attribution window than the traffic period.
- Optimizing for a higher conversion rate while ignoring lower traffic quality or order value.
Use the calculator
Calculate conversion rate, expected conversions or required traffic for any campaign.
Open Conversion Rate CalculatorChoose the denominator that fits the funnel
If 75 purchases come from 2,500 sessions, the session conversion rate is 3%. If you calculate from unique users instead, the percentage may change. State which denominator is used in reporting.
Segment before drawing conclusions
Compare like traffic sources, devices and landing pages. A higher conversion rate with fewer qualified visits may not produce more sales; pair the percentage with total conversions and value.
Frequently asked questions
Should I use users, sessions or clicks?
Use the denominator your business question and analytics source require, then keep that definition consistent across comparisons.
Can conversion rate be over 100%?
It can if one traffic unit can generate multiple counted conversions, but many purchase conversion-rate definitions cap naturally below 100%.
Why do ad platforms and analytics tools show different rates?
They may use different attribution windows, conversion definitions, identity methods or traffic denominators.
What should I verify about segment before drawing conclusions?
Compare like traffic sources, devices and landing pages. A higher conversion rate with fewer qualified visits may not produce more sales; pair the percentage with total conversions and value.