Experiment Duration Estimator

Calculate How Long to Run Your A/B Test

Parameters

users/day
%
%
control + test(s)
α (two-tail)
1 - β
Tip: For multi-variant tests, the calculator accounts for the Bonferroni correction (more stringent significance level). Use 2 variants for standard A/B tests.

Results

Recommended Duration
·
days to run experiment
Total Sample Size
·
Per Variant
·
Visitors Needed Per Day
·
Percentage of daily traffic

Duration vs Sample Size

The chart shows how sample size requirements decrease as you increase experiment duration. Longer tests allow sequential monitoring with lower Type I error risk.

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