Sample Size Calculator

Estimate the minimum sample size or duration required to support your experiment design. Try LaunchDarkly Experimentation for free to maximize the impact of every feature release.

Effect to sample size and durationSample size and duration to effect
Minimum detectable effect
%
Sample size and duration
units/day
days
units/day

Advanced settings

Two-sided

Used to determine if the test variation is different from the control

Upper-tailed

Used to determine if the test variation is better than the control

Lower-tailed

Used to determine if the test variation is worse than the control

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