Marketer Workspace · Experiment planning

A/B Test Duration Calculator

Estimate sample size per variant and test duration for a two-proportion conversion-rate experiment. It is a planning aid, not a substitute for analytics review.

Baseline conversion rate (%)

Minimum detectable effect, relative (%)

Confidence

Power

Daily visitors per variant

Variants

Estimated requirement

Enter your baseline and traffic.

Guardrails

Scenario table

MDE	Sample / variant	Days