A/B test significance calculator

Compare two conversion rates and estimate uplift, z-score and p-value.

Result

Conversion A

Conversion B

10%

Uplift

25%

p-value

0.1181

Z-score: 1.563
Approx. confidence: 88.19%

Z-score	1.563
Approx. confidence	88.19%

A/B conversion significance calculator

The calculator helps product and marketing teams quickly inspect whether a conversion difference looks meaningful.

Use proper experiment design for final decisions: sample size, duration, segmentation and multiple testing matter.

✓ Use the calculator to turn input values into a clear, repeatable result.

✓ Keep units and assumptions visible so the calculation can be checked later.

✓ Copy the result or key numbers for reports, messages or spreadsheets.

✓ Reset to defaults when you want to compare another scenario from a clean state.

✓ Calculators run in the browser and are useful for quick estimates before formal checks.

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A/B test significance calculator