A/B Test Duration Calculator | Henkan Toolkit

Daily visitors (total for all variations)

Current conversion rate (%)

How many variations (including control) do you want to test?

Test Objective (Minimum Detectable Effect)

De-risk launch (±0.1% change)

Check for an increase (10% of baseline)

Check for a decrease (5% of baseline)

Custom MDE

I don't know my MDE. Show me results by week.

Advanced Mode (Optional)

Enter the number of daily visitors to your website or app.
Input your current conversion rate as a percentage.
Select the number of variations you want to test, including the control.
Choose your test objective or minimum detectable effect (MDE).
If desired, adjust advanced settings like significance level and statistical power.
Click "Calculate Test Metrics" to see the required sample size and test duration.
Review the results, including test duration, sample size per variation, and total sample size.

Daily Visitors: The average number of unique visitors to your website or app per day.
Conversion Rate: The percentage of visitors who complete a desired action (e.g., making a purchase, signing up).
Variations: The different versions of your website or app that you're testing, including the control.
Minimum Detectable Effect (MDE): The smallest improvement in your conversion rate that you want to be able to detect with statistical significance.
Statistical Significance: The likelihood that the difference between variations is not due to random chance.
Statistical Power: The probability of detecting a true effect when it exists.
Sample Size: The number of visitors required for each variation to achieve statistical significance.

Duration Calculator