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Brightback Testing Sample Size Calculator

Estimate the sample size and experiment duration needed to achieve statistical significance in your Brightback tests.

This may be your baseline (pre-Brightback) flow or your Brightback no-offer control.
10%
The minimum change in the deflect rate that you would like to be able to detect
12%
Set your threshold for statistical significance (lower is riskier), with 95% being an accepted standard in research.
95%

7%12%17%22%MDE (absolute percentage)080160240320Sample size
MDE (absolute)Sample size1 experiment2 experiments
8%2413.61 Days7.23 Days
10%1572.35 Days4.71 Days
12%1111.67 Days3.33 Days
14%821.23 Days2.46 Days
16%640.96 Days1.92 Days