A/B Sample Size Calculator
> Calculate the required audience size.
> Standard Evan Miller formula.
20%
Current metric value (e.g., Purchase CR).
5%
Relative uplift we want to detect.
Sample Size (per variant)
25 554
You need51 108users in total for the test (Variant A + Variant B).
CONFIDENCE: 95%POWER: 80%
Sample Size Calculator | A/B Test Planning
Calculate the required sample size for your A/B test. Based on Evan Miller's formula.