A/B Testing Calculators That Actually Help
Ultra-simple, high-signal calculators for experimentation practitioners. No jargon, no complexity — just answers.
Sample Size
Calculate required sample size for your A/B test with guided presets.
SRM Checker
Detect sample ratio mismatch issues fast with paste-friendly input.
Conversion Lift
Quantify uplift and statistical significance from your experiment results.
Duration Estimator
Estimate how long your experiment needs to run based on traffic.
Annualized Impact Calculator
Project your experiment results to annual business impact. Includes decay modeling, seasonality adjustments, and revenue/conversion tracking.
Why These Calculators?
Zero Jargon
Plain language explanations. We interpret the numbers so you don't have to.
100% Private
All calculations happen in your browser. Your data never leaves your device.
Opinionated Defaults
Industry best practices baked in. Get started in seconds, not minutes.