A/B-test Calculator

Confidence Interval

#### Calculate A/B-test Result

Frequentist calculator for A/B-tests. Includes the expected uplift range for a given probability.

##### A/B-Test Numbers

###### Control

###### Variant

##### Expected Uplift

probability that the variant outperforms control.

expected uplift (% chance to
exceed this range)

###### Observations

Observed Uplift:

SRM:

###### Confidence Intervals

Control: Variant:

#### Calculate probabiolity distribution for a binominal proportion

What could have been an observed ratio as well? Using the Clopper-Pearson Method

##### Input

##### Conversion Rate

The given confidence level means a % chance to exceed the expected bounds.

#### Why I built these calculators

When you search the internet for A/B-test calculators for Conversion Optimization, you can find enough of them. But, I always miss information or possibilities in all of them. That's why I decided to build my own calculators.

If you have any suggestions for improvement, please contact me :).