Most A/B tests are stopped at the moment they look good, which is exactly when they mean least. This gives the number of visitors to wait for, decided before the test starts.
A/B test sample size calculator
How many visitors each variant needs before a difference means anything, from your current rate and the improvement worth detecting.
Visitors per variant
7,600
Total visitors
15,200
Days to run
30.4
Weeks to run
4.34
Расчёт мгновенно в вашем браузере · данные не отправляются
Как это работает
- 1Enter the rate you convert at today.
- 2Decide the smallest improvement worth acting on.
- 3Read the duration, then commit to it before starting.
Для кого это
- •Planning a landing page test
- •Deciding whether a test is even feasible
- •Settling an argument about a winner
Советы профи
- A 60/40 split over thirty visitors is noise, and acting on it costs months.
- This is the usual approximation at 95 percent confidence and 80 percent power. It sizes a test; it does not replace a statistician.
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