Experiment Duration Calculator

Estimate how long a test will take.

Convert sample size and eligible daily traffic into a rough test duration.

Experimentation

Estimate test duration

Turn a required sample size into a rough calendar estimate.

Sample / variantEligible visitors / dayTotal variantsTraffic allocated %

Total sample36,000

Traffic / variant / day1,250

Estimated days15

Estimated weeks2.1

This is a traffic estimate, not a stopping rule. Keep full business cycles, weekday effects, seasonality, and data-quality checks in mind before ending a test.