Sample Size Calculator

By CalculatorInn Team · Updated: 2026-03-22 · Free & accurate · Instant results

Sample Size Calculator — free online tool.

Interactive Sample Size Calculator

JavaScript is required for the interactive calculator. Enable JavaScript to use this tool.

How to Use This Calculator

Step-by-Step Instructions

  1. Enter your confidence level
  2. Enter your 90%
  3. Enter your 95%
  4. Enter your 99%
  5. Enter your margin of error (%)
  6. Enter your population size (0=infinite)
  7. Enter your required sample size
  8. Enter your without correction
  9. Enter your confidence level
  10. Enter your margin of error
  11. Enter your z-score
  12. Results appear instantly — no button needed

Formula

Mathematical Formula

See calculator

How It Works

See calculator

Frequently Asked Questions

How does this work?

Enter values for instant results.

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