Digital marketing calculators
A/B Test Significance.
Enter visitors and conversions for two variants to estimate lift, a two-tailed p-value and a 95% confidence interval for the difference.
Browser-based tool
Use A/B significance
Nothing you enter here is sent to a Website-Me server.
01 / use the tool
How to use A/B significance
- Enter the values you know in the form.
- Run the tool and review the result alongside the notes below.
02 / interpret the output
What the result means
The output estimates lift, p-value and a confidence interval using a two-proportion z-test approximation.
Important considerations
- Statistical significance is not the same as business significance.
- Do not stop or declare a winner based on one number without considering test design and bias.
Worked example
Use a small, realistic example first so you can see how the output changes when one input changes.
03 / continue working
Related tools
Move to the next relevant task without losing the context of this page.
04 / relevant support
Need help applying the result?
The tool is a useful starting point. Website-Me can help connect the next step to the wider site, SEO or GEO work.