A/B Test Sample Size Calculator

Determine the required sample size for a statistically significant A/B test.

Experiment Parameters

Enter the details of your planned A/B test.

Baseline Conversion Rate (%)

The current conversion rate of your control (variation A).

Minimum Detectable Effect (MDE) (%)

The smallest relative improvement you want to be able to detect (e.g., 10% uplift).

Statistical Significance

The probability that you will not make a false positive error.

Required Sample Size

Based on a standard statistical power of 80%.

15,333

visitors per variation (A and B).