Sample size calculator
How long should you run it?
Set your baseline, the smallest lift worth caring about, and your weekly traffic. Get the sample size and duration.
Your plan
Current conversion rate
Your baseline (variant A)
%
Minimum detectable effect
Smallest relative lift worth detecting
%
Weekly visitors
Total across both variants
You need
31,231visitors per variant
That's 62,462 visitors total across both variants. At 10,000 visitors per week you should plan for around 6.2 weeks.
Per variant
31,231
visitors
Duration
6.2w
of steady traffic
Earliest end
Sep 3
2026
Timeline
Start · Jul 217 weeks
Finished the test?