Conversion Rate Calculator
Compute conversion rates from visitors and conversions, compare two rates, and calculate the confidence interval around each estimate. Useful for landing page and funnel analysis.
Conversion rate
2.500%
95% CI
2.212% – 2.825%
How to use the conversion rate calculator
Enter total visitors and conversions. We return the conversion rate plus a 95% Wilson confidence interval — a more accurate range than the textbook normal approximation, especially for small samples or extreme rates.
Formula & explanation
Rate = conversions ÷ visitors. CI uses Wilson score interval at z = 1.96.
Examples
10000 visitors, 250 conversions → 2.50% rate (95% CI: 2.21% – 2.83%).
Frequently asked questions
- Why not Normal approximation?
- Wilson is well-behaved for small n and rates near 0% or 100% where the normal CI can extend below 0 or above 1.
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