A/B testsample size calculatorsample size calculator

Powered by Optimizely Experimentation's stats engine.

Baseline conversion rate

Your control group's expected conversion rate[?]

%

Minimum Detectable Effect

The minimum relative change in conversion rate you would like to be able to detect..[?]

%

Statistical Significance

95% is an accepted standard for statistical significance, although Optimizely allows you to set your own threshold for significance based on your risk tolerance.. [?]

95%

80%99%

Sample size per variation

13,000

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Sample size per variation

Questions you might have

What is Experimentation stats engine?keyboard_arrow_down

How many visitors do I need for my A/B test?keyboard_arrow_down

Why is your calculator different from other sample size calculators?keyboard_arrow_down

How do I determine the baseline conversion rate?keyboard_arrow_down

What is minimum detectable effect (MDE)?keyboard_arrow_down

How do I estimate a value for minimum detectable effect (MDE)?keyboard_arrow_down

Where is statistical power in your sample size calculator?keyboard_arrow_down

A/B testsample size calculatorsample size calculator