A/B Test Calculator
Sample size. Test duration. Just the facts.
Plan your A/B test: the sample size per variant and how long to run it to detect a target uplift at 95% confidence and 80% power.
Statistical Rigor
Classical power analysis based on means and coefficient of variation. No guesswork, just math.
Instant Results
Get the sample size per variant and the test duration in milliseconds. Clear planning without spreadsheets.
Clear Guidance
Know exactly how many users you need per variant and how long to run the test. Like consulting a growth analyst.
Built For Teams That Ship Fast
Designed for founders, marketers, and product teams who need answers, not spreadsheets
✓ Solo Founders
Validate marketing experiments without hiring a data analyst
✓ Growth Marketers
Test copy, ads, and landing pages with statistical confidence
✓ Product Teams
Analyze feature rollouts and UX changes with precision
✓ E-commerce Shops
Optimize checkout flows and product pages for maximum revenue
Ready to Run Your Test?
Get your sample size per variant and test duration in seconds