Chi-Squared TestConfidence LevelRelative Lift

How It Works

1

Enter Data

Input visitors and conversions for each variant.

2

View Significance

See confidence level and p-value.

3

Make Decision

Determine if the difference is statistically significant.

Frequently Asked Questions

What is statistical significance?
Statistical significance means the difference between variants A and B is unlikely due to random chance. A confidence level of 95% or higher is the standard threshold.
What is the chi-squared test?
The chi-squared test compares observed frequencies to expected frequencies to determine if there is a significant association between the variant and conversion outcome.
How much data do I need?
More data gives more reliable results. As a rule of thumb, aim for at least 1,000 visitors per variant. The required sample size depends on the expected effect size.
Share:Copied!
Was this tool helpful?

Get a free API key + new tools as they ship

100 calls/day, no card, no spam. Built by one person, in public.

About A/B Test Calc

Working with this task no longer requires installing heavy desktop software — A/B Test Calc runs entirely in your browser, instantly. Processing runs locally in your browser using modern Web APIs. Nothing is uploaded, nothing is logged, and there is no quota to worry about for casual use. Like everything else in the utility collection, it is free, ad-light, and works on mobile as well as desktop.

When you'd reach for A/B Test Calc

  • You're hitting the daily limit of a paid SaaS and need a backup option for a single quick job.

    Marketers and ops people whose primary tool is metered.

    Stay productive without burning credits.

  • You need to handle a one-off task right before a meeting and don't have time to install anything.

    Anyone working remotely on a borrowed or restricted machine.

    Open the page, get the result, paste it into your doc — under a minute.

  • You're cleaning up a folder of files that accumulated over a project and need to standardize them.

    Designers, writers, and developers wrapping up deliverables.

    Drop each file in, copy the output, move on.

  • You're on a public or shared machine and don't want to leave traces of what you're working on.

    Travelers, contractors, anyone working from a friend's computer.

    Nothing is uploaded, nothing persists if you're not signed in.

Frequently asked about A/B Test Calc

Is A/B Test Calc really free?
Yes — A/B Test Calc is free for unlimited personal use, with no account required and no watermark on the output.
Do I need to create an account to use A/B Test Calc?
No. A/B Test Calc works without any signup. We only ask for an email if you decide to subscribe to a paid plan.
Can I use A/B Test Calc commercially?
Yes. The output of A/B Test Calc belongs entirely to you, with no licensing restrictions.
Does A/B Test Calc work on mobile?
Yes, A/B Test Calc is fully responsive and tested on iOS Safari and Android Chrome.
Are my files uploaded to a server when I use A/B Test Calc?
A/B Test Calc processes everything in your browser using local APIs. Your files never leave your device.

Deep Dive: Related Research

The Complete Guide to SEO: Technical, Content & Link Building (2026)

27,000 words · 60 min read

Web Performance Format Guide 2026: Images, Fonts, Scripts, and Core Web Vitals

11,500 words · 24 min read

Explore More