Free Calculator

A/B Test Sample Size Calculator

Calculate the required sample size for statistically valid A/B tests. Set your baseline conversion rate, minimum detectable effect, confidence level, and power to get accurate results instantly.

5%
Current conversion rate of your control variant
%

Relative lift: 5% → 6.00%

Enter your daily visitor count to estimate test duration

Required Sample Size

Per Variant

visitors

Total

visitors

About A/B Test Sample Size Calculator

Use the Ab Test Sample Size to accomplish your task quickly and efficiently right in your browser. This tool runs entirely client-side — no file uploads, no server processing, and no account required. Your data stays on your device for complete privacy.

How to Use

  1. Open the tool and provide the required input (text, file, or data).
  2. Configure any available settings to match your needs.
  3. Click the action button to process your request.
  4. View, copy, or download the results.

Frequently Asked Questions

Is the Ab Test Sample Size free to use?
Yes, completely free with no hidden costs, no subscriptions, and no usage limits. Use it as often as you need.
Do I need to create an account?
No. The tool works immediately — no sign-up, no email address, and no personal information required.
Is my data private and secure?
Yes. All processing happens in your browser using JavaScript. No data is uploaded to any server. Your input and output stay entirely on your device.
Does this work on mobile devices?
Yes. The tool is fully responsive and works on smartphones, tablets, and desktop computers with any modern web browser.