Statistical Significance Tool
A/B Testing Calculator
Determine if your A/B test results are statistically significant. Calculate confidence levels and make data-driven decisions.
1,567 calculations
★★★★★4.9/5 rating
Free Tool
Enter Your Test Data
Control Group (A)
Conversion Rate: 5.00%
Variation Group (B)
Conversion Rate: 6.50%
Test Results
Not Yet Significant
Improvement:+30.00%
Confidence:73.5%
Required Confidence:95%
Need more data: Continue running your test to reach statistical significance. Current confidence is at 73.5%.
Sample Size Recommendation
For a 5% baseline conversion rate with 20% minimum detectable effect:
~19 visitors per variation
How to Use This Calculator
1
Enter Control Data
Input visitors and conversions for your control (original) version
2
Enter Variation Data
Input visitors and conversions for your variation (test) version
3
Select Confidence Level
Choose your desired confidence level (95% is standard)
4
Review Results
Check if your test is statistically significant
5
Make Decision
Implement the winner or continue testing if not significant
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