A/B Test Calculator
Variant A
Conversion rate : 0%
Variant B
Conversion rate : 0%
Confidence level
0.00%
No statistically significant winner
How to use this calculator?
1. Enter the number of visitors and conversions for each variant
2. Statistical significance is calculated automatically
3. A result above 95% is considered statistically significant
About
What is it?
The A/B Test calculator is a statistical tool that determines whether differences observed between two variants are statistically significant, or simply due to chance.
Why use it?
Without statistical significance, you risk making wrong decisions based on random results. This tool gives you mathematical certainty before declaring a winner.
How does it work?
Enter the number of visitors and conversions for each variant. The tool automatically calculates the conversion rate, relative improvement and statistical confidence level.
Usage tips
- Aim for at least 95% confidence level before drawing conclusions
- Wait for a minimum of 100 conversions per variant
- Test only one variable at a time for reliable results
- Avoid checking results too early — let the test run its course
- Document each test with hypothesis, duration and result