AB Test Sample Size Calculators by CXL

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Test statistic details and sample size and duration calculators (unlock from test data to use as stand alone tools)

Sample size calculator

Baseline conversion rate (control)

%

Confidence level

%

Statistical power

%

Conversion rate lift %

%

Number of variants

Required sample size per variant

.

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Duration calculator

Baseline conversion rate (control)

%

Minimal detectible effect

%

Number of variants

Number of daily visitors (total)

Percent traffic in test

%

How long in total to run the test

—

Monthly monetary contribution based on data above

Average order value of one non-control variant

Minimal detectible effect (MDE)

Week

MDE

1

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2

—

3

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4

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5

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6

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SRM-alert: if you intended to have a 50% / 50% split, we measured a possible Sample Ratio Mismatch (SRM) .Please check your traffic distribution.