A/B Test Calculator
Free A/B test calculator. Calculate statistical significance for your experiments. Get z-score, p-value, and confidence intervals for conversion rate tests.
How to Calculate A/B Test Significance
- 1 Enter the number of visitors for your control group
- 2 Input the conversions for your control group
- 3 Enter visitors and conversions for your variation
- 4 Select your desired confidence level (90%, 95%, or 99%)
- 5 Click Calculate to see statistical significance results
- 6 Review the winner, uplift, and p-value interpretation
Frequently Asked Questions
Is my code or data stored anywhere? ▼
No. All developer tools process data locally in your browser. Nothing is sent to any server or logged.
Can I use these tools offline? ▼
Yes! After the initial page load, most developer tools work without an internet connection.
Are there API limits? ▼
No limits. Since processing happens in your browser, you can use the tools as much as you need.
Is the output compatible with production use? ▼
Yes. Our tools produce standard-compliant output suitable for production environments.
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Last updated: January 15, 2026 · v2.1