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

Need Help With A/B Testing?

Our conversion experts can design and run your A/B tests for maximum impact.