Name: Experimenter's Calculator
Author: Simon Jackson

Experimenter's CalculatorFree A/B test calculators for sample size, test duration, minimum detectable effect, results analysis and sample ratio mismatch.

Sample Size Calculator — How big should my sample size be? Calculate the right sample size to detect meaningful differences.

Test Duration Calculator — How long should I run my test? Determine optimal test duration based on traffic and effect size.

Effect Detection Calculator — What's the smallest effect I can detect? Find the minimum detectable effect with your current setup.

Test Results Analyzer — I've run a test. Show me the results. Analyze your A/B test results with confidence intervals.

Sample Ratio Mismatch Checker — Are my sample sizes skewed? Check that your experiment properly randomized units.

Built by Simon Jackson, founder of Cherto, a warehouse-native experimentation platform.