A/B Test Significance Calculator
Free tools / Cordell Digital
A/B Test Significance Calculator
Two-sided pooled two-proportion z test for independent, fixed-horizon samples. Not a sequential test; do not repeatedly peek and stop at significance.
Your result
How to use this calculator
Use figures from the same reporting period and the same attribution scope. Sample inputs are hypothetical examples. Results describe the inputs you provide; they are not industry benchmarks or promises of future performance.
Calculation method
Two-sided pooled two-proportion z test for independent, fixed-horizon samples. Not a sequential test; do not repeatedly peek and stop at significance.
Method: NIST two-proportion normal approximation.
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