Free Calculator
A/B Testing Calculator
Calculate statistical significance for your form A/B tests. Get conversion rates, uplift percentage, and confidence levels to determine your winning variant.
Test Data
Variant A (Control)
Conversion Rate: 5.00%
Variant B (Treatment)
Conversion Rate: 6.50%
Ready to Analyze
Enter your test data and click "Calculate Results" to see if your A/B test has a clear winner.
Understanding A/B Test Results
Clear Winner
P-value < 0.05 means you can confidently declare a winning variant.
Inconclusive
P-value ≥ 0.05 means you need more data to reach statistical significance.
Sample Size
Larger samples provide more reliable results. Aim for 1000+ visitors per variant.
Key Metrics Explained:
Z-Score: Measures how many standard deviations the difference is from zero. Higher absolute values indicate stronger evidence.
P-Value: Probability that the observed difference occurred by chance. Lower values indicate stronger evidence of a real difference.
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