Free A/B Split Test Duration Calculator

Estimate how long you should run their A/B tests based on current traffic, desired confidence level, and expected improvement.
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How to use this tool:

Enter your average daily visitors: Input the number of unique visitors your webpage receives per day.

Select your baseline conversion rate: Use the slider to indicate your current conversion rate (e.g., 2% if 2 out of 100 visitors convert).
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Choose your minimum detectable effect: This is the smallest improvement you want to be able to detect. For example, if you want to detect a 10% improvement, select 10%.

Set your desired confidence level: Typically, 95% or 99%. This determines how certain you want to be in your results.
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Click "Calculate": The tool will process your inputs and display the estimated test duration in days.

Review the results: You'll see how many days you should run your test, along with the total number of visitors needed for each variation.
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Adjust inputs (optional): Try different scenarios by adjusting your inputs and recalculating.