UTM builder, link checks and A/B test math

A/B Test and Conversion Calculators

These calculators support testing. Plan a test with the sample size and minimum detectable effect, judge a finished test with the significance calculator, and compute a conversion rate with its range.

Tools in this group

  • AB Test Sample Size Calculator — Enter your baseline conversion rate and the smallest lift worth detecting to get the visitors needed per variant, the total, and how many days the test takes at your traffic.
  • AB Test Significance Calculator (A/B Split Test) — Enter visitors and conversions for A and B, and optionally C and D, to see the uplift with its range, the p-value and a plain-words verdict on whether the difference is statistically significant.
  • Conversion Rate Calculator — Enter conversions and visitors to get your conversion rate with a 95% range, revenue per visitor, or work backwards to the conversions or visitors a target rate needs.
  • Minimum Detectable Effect (MDE) Calculator — Enter your baseline conversion rate and your traffic to see the smallest lift an A/B test can reliably detect, and how that shrinks week by week.