Google Ads Statistics

Confidence Interval Calculator

How reliable is the conversion rate, really? Just enter the number of clicks and conversions—the calculator displays the 95% confidence interval (Wilson score) and the number of clicks needed to obtain a meaningful result.

95 % Confidence Interval for the Conversion Rate
Clicks needed for ± 0.5 percentage points

Wilson score interval (z = 1.96). Rule of thumb: the rate only becomes reliable after a few thousand clicks.