A/B Sample Size Calculator
Calculate the minimum sample size as well as the ideal duration of your A/B tests based on your audience, conversions and other factors like the Minimum Detectable Effect.
| Test Settings | Pick Values | Explanation |
|---|---|---|
| Weeks of data in Import [?] | Used to estimate how much time you should leave the exp going | |
| Confidence level / Statistical Significance [?] | % | Protection against Type I error (False Positive) Go for 95% minimum |
| Statistical Power (1-β) [?] | % | Protection against Type II error (False Negative) Go for 80% minimum |
| Minimum Detectable Effect [?] | % | Relative change in %. Don't go below 10% or your sample size will balloon up |
| % visitors from User Base included in the test [?] | % | Default: 100% |
Add Your Tests Below
| Exp Name | GA Segment Name | Visitors in Segment (population) | Conversions (Transactions) | Required Sample Size per Variant (I) | Weeks to Run (I) | Action |
|---|---|---|---|---|---|---|
| Test 1 | Seg 1 | Not Calculated | Not Calculated | |||
| Test 2 | Seg 2 | Not Calculated | Not Calculated |