CRO
Sample Size
The number of visitors required per variant to detect a meaningful effect at the chosen confidence level.
Definition
What it actually means.
Sample size calculations depend on baseline conversion, minimum detectable effect, statistical power (typically 80%), and confidence level (typically 95%). Skipping sample size sizing is the #1 reason teams ship losing variants.
Related calculator
A/B Test Sample Size Calculator
How many visitors before your test is conclusive.
Run the calculatorRelated terms
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