Blood Type Calculator

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

Blood Type Calculator

Interactive Blood Type 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 parent 1 blood type
  2. Enter your a+
  3. Enter your a-
  4. Enter your b+
  5. Enter your b-
  6. Enter your ab+
  7. Enter your ab-
  8. Enter your o+
  9. Enter your o-
  10. Enter your parent 2 blood type
  11. Enter your a+
  12. Enter your a-
  13. Enter your b+
  14. Enter your b-
  15. Enter your ab+
  16. Enter your ab-
  17. Enter your o+
  18. Enter your o-
  19. Enter your possible blood types
  20. Enter your rh factor
  21. Enter your parents
  22. Enter your most common
  23. Results appear instantly — no button needed

Formula

Mathematical Formula

Based on Mendelian genetics of ABO and Rh factor inheritance

How It Works

Based on Mendelian genetics of ABO and Rh factor inheritance

Frequently Asked Questions

How does this work?

Enter values and get instant results using the formula shown.

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