A/B Testing Calculator & Guide
Statistical tools and educational resources for designing, analyzing, and understanding A/B testing experiments. Perfect for product managers and data analysts.
Sample Size Calculator
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Current conversion rate of your control variant (e.g., 2.5%, 15.7%)
%
Relative improvement you want to detect (e.g., 20%, 15.5%)
Probability of false positive (typically 0.05 for 95% confidence)
Probability of detecting a true effect (typically 0.8 for 80% power)
Visitors per day to estimate test duration
Results
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Enter your parameters and click "Calculate Sample Size" to see the results.