Marketing

Split Test Sample Size Calculator

Calculate the minimum number of visitors per variant needed to detect a real improvement in your A/B test. Stop testing too early — underpowered tests lead to false wins.

Baseline Conversion Rate (%)

Your current CVR before the test

Minimum Detectable Effect (%)

Smallest relative improvement worth detecting (e.g. 20% = from 3.5% to 4.2%)

Statistical Confidence

Statistical Power

Daily Visitors to This Page

Used to calculate test runtime

visitors per variant (both A and B)

Estimated Test Duration