Free A/B Testing Tools
A/B Testing Calculators
Plan statistically significant experiments with our free calculators. No signup required.
Sample Size Calculator
Calculate exactly how many visitors you need for statistically significant A/B test results.
95% confidence level
80% statistical power
Instant results
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Test Duration Calculator
Find out how long to run your A/B test based on your traffic and conversion goals.
Traffic-based estimates
MDE calculations
Week recommendations
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ROI Calculator
Calculate the potential revenue impact and ROI of your A/B testing program.
Revenue projections
Compound lift analysis
Annual ROI
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