P-Value Calculator

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

P-Value Calculator — free online tool.

Interactive P-Value 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 z-score or t-score
  2. Enter your test type
  3. Enter your two-tailed
  4. Enter your one-tailed (left)
  5. Enter your one-tailed (right)
  6. Enter your p-value (approx)
  7. Enter your significance
  8. Enter your z/t score
  9. Enter your test type
  10. Results appear instantly — no button needed

Formula

Mathematical Formula

See calculator

How It Works

See calculator

Frequently Asked Questions

How?

Enter values for instant results.

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