Conversion Rate Calculator
Use your own numbers after reviewing the formula and worked example.
Quick answer
Conversion rate measures the share of an eligible audience that completes a defined action.
Formula or method
Keep units, percentages and time periods consistent. The formula is useful as a transparent check on the calculator result and helps explain why changing one input changes the answer.
Step-by-step
- Define the conversion.
- Choose the correct denominator.
- Use the same date range.
- Divide and multiply by 100.
Worked example
250 purchases from 10,000 sessions equals a 2.5% session conversion rate.
How to interpret the result
The metric is meaningful only when numerator and denominator definitions stay consistent.
When the answer is used for a purchase, loan, payroll decision, construction order, school grade, health estimate or other real-world choice, verify the assumptions that matter in that context. Accurate arithmetic still depends on accurate inputs.
Common mistakes
- Using impressions when you mean click-to-sale rate.
- Mixing periods.
- Ignoring traffic quality.
Frequently asked questions
What is a good conversion rate?
There is no universal benchmark.
Can it exceed 100%?
Some event-based definitions can, but many user/session definitions cannot.
Users or sessions?
Use the denominator that matches the question and stay consistent.