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Sample Size Calculator

Calculate required sample size for A/B tests

Sample per Variant
4075
Total Sample
8150
Est. Duration
9 days

📊 Understanding the Numbers:

  • Baseline: Current conversion rate (5%)
  • MDE: Smallest improvement you want to detect (1%)
  • Confidence: How sure you want to be (95%)
  • Power: Ability to detect true effects (80%)

What is Sample Size Calculator?

The Sample Size Calculator estimates the number of participants needed per variant to detect a minimum detectable effect with a chosen confidence and power level.

Useful for A/B testing planning so you can ensure experiments are statistically meaningful.

Key Features

  1. Baseline & MDE – Enter baseline conversion and minimum detectable effect
  2. Confidence & Power – Configure statistical strength of the test
  3. Duration Estimate – Optionally provide daily traffic to estimate test duration
  4. Easy to Use: Simple interface for quick sample size calculator operations
  5. Fast Processing: Instant results with high performance
  6. Free Access: No registration required, completely free to use
  7. Responsive Design: Works perfectly on all devices
  8. Privacy Focused: All processing happens in your browser

How to Use Sample Size Calculator

  1. Step 1 – Enter baseline conversion and desired MDE
  2. Step 2 – Choose confidence level and statistical power
  3. Step 3 – Optionally add daily traffic to estimate how long the test will run

Why Use Sample Size Calculator?

  • Efficient: Avoid underpowered tests that waste traffic
  • Accurate: Plan experiments with statistical rigor
  • Actionable: Estimate duration to help planning

Plan robust experiments by knowing how much traffic you need.

Benefits

  • Time Saving: Complete tasks quickly and efficiently
  • User Friendly: Intuitive design for all skill levels
  • Reliable: Consistent and accurate results
  • Accessible: Available anytime, anywhere

FAQ

What is Sample Size Calculator?

Sample Size Calculator is an online tool that helps users perform sample size calculator tasks quickly and efficiently.

Is Sample Size Calculator free to use?

Yes, Sample Size Calculator is completely free to use with no registration required.

Does it work on mobile devices?

Yes, Sample Size Calculator is fully responsive and works on all devices including smartphones and tablets.

Is my data secure?

Yes, all processing happens locally in your browser. Your data never leaves your device.