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A/B

A/B Test Calculator

Two-proportion significance and sample size.

Two-proportion z-test (two-sided). Also shows a sample-size estimate.

A: 10.00%
B: 12.00%
diff: 2.00%
lift: 20.00%
z: 1.4293
p: 0.152918
significant: no
winner: B
sampleSize/variant: 14751

About A/B Test Calculator

Evaluates conversion-rate differences with a z-test and shows a sample-size estimate. Everything runs in your browser.

How to use

  1. Enter A/B visitors and conversions
  2. Review significance and lift
  3. Check sample-size guidance

FAQ

Is this rigorous?

It is a quick estimate, not a substitute for formal experiment design.

Uploaded?

No.