Free PM Tool
A/B Test Significance Calculator
Calculate if your A/B test results are statistically significant. Get p-values, confidence intervals, and power analysis.
Variant A (Control)
Conversion Rate
4.00%
Variant B (Test)
Conversion Rate
4.60%
Result
✅ Statistically Significant
At 95% confidence • p-value = 0.0365
Variant A CVR
4.00%
Variant B CVR
4.60%
Absolute lift
0.60pp
Relative lift
+15.00%
Z-score
2.091
95% CI (diff)
[0.04pp, 1.16pp]
Statistical power
55.2%
💡 How to interpret
A statistically significant result at 95% confidence means there's less than a 5% chance the observed difference is due to random noise. If power is below 80%, your sample size may be too small to detect a real effect — run the test longer.Related Tools
RICE Prioritization Calculator
Score and rank product features using Reach × Impact × Confidence ÷ Effort.
Try it freeTAM SAM SOM Calculator
Estimate your total addressable market with top-down and bottom-up approaches.
Try it freePM Interview Guide
Master execution, product sense, and estimation with proven frameworks.
Try it freeWant Personalized PM Coaching?
Get 1:1 coaching, live feedback, and proven strategies in our 12-week bootcamp.