Sample Size Calculator

Find out how long your Bayesian A/B test will need to run for by using simulations based on daily visitors and baseline conversion rates.

Experiment parameters

A good baseline conversion rate is just the average of the last 30 days.

This is the number of unique website visitors who would see the experiment.

This is the number of groups (including control), that you're testing with.

This is the maximum number of days you want to run this experiment for (recommended minimum 14 days).