Sample Size Calculator
Calculate the required sample size for your A/B test based on baseline conversion rate, minimum detectable effect, and statistical power.
Total sample size needed
29,502
Control: 14,751 (50%)·Variant: 14,751 (50%)
For conversion rates, click-through rates, etc.
%
Current conversion rate of your control group
%
Smallest effect size you want to detect
%
Probability of detecting a real effect (80% is standard)
%
False positive rate (5% is standard)
50% / 50%
Control vs variant split (50/50 is most efficient)
Estimated duration
At 1k visitors/day30 days
At 5k visitors/day6 days
At 10k visitors/day3 days