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Blood Type Compatibility

Check blood type compatibility for transfusion and donation

Reviewed: AnyCalc Editorial|2026-07-19|Editorial policy|About

What this calculator does

The Blood Type tool helps you understand blood type donation and reception compatibility for red blood cell transfusions. It displays clear tables and a compatibility matrix showing which blood types can safely donate to and receive from each other. Understanding your blood type is important for medical emergencies and general health awareness. The tool covers the ABO blood group system and the Rh factor (positive and negative) in an easy-to-read format. It is a useful educational reference for students studying biology, healthcare workers reviewing transfusion guidelines, or anyone curious about how blood type compatibility works.

Can Donate To (4 types)

  • ✗O-
  • ✓O+
  • ✗A-
  • ✓A+
  • ✗B-
  • ✓B+
  • ✗AB-
  • ✓AB+

Can Receive From (2 types)

  • ✓O-
  • ✓O+
  • ✗A-
  • ✗A+
  • ✗B-
  • ✗B+
  • ✗AB-
  • ✗AB+

Full Compatibility Matrix

Rows = Recipient, Columns = Donor

R \ DO-O+A-A+B-B+AB-AB+
O-✓✗✗✗✗✗✗✗
O+✓✓✗✗✗✗✗✗
A-✓✗✓✗✗✗✗✗
A+✓✓✓✓✗✗✗✗
B-✓✗✗✗✓✗✗✗
B+✓✓✗✗✓✓✗✗
AB-✓✗✓✗✓✗✓✗
AB+✓✓✓✓✓✓✓✓

How to use

  1. 01
    Select your blood type
    Choose your ABO blood type and Rh factor (positive or negative).
  2. 02
    View compatibility
    See which blood types you can donate to and receive from.
  3. 03
    Review the matrix
    Browse the full compatibility matrix for all blood type combinations.

Blood Type Compatibility FAQ

What is the universal blood donor type?▾
O negative (O-) is the universal red blood cell donor type, meaning it can be given to patients of any blood type in emergencies. AB positive (AB+) is the universal recipient.
What does the compatibility matrix show?▾
The compatibility matrix displays all blood types across rows and columns, showing at a glance which combinations are compatible for donation. It covers both ABO type and Rh factor, making it easy to look up any blood type pair.
Why does Rh factor matter for blood transfusions?▾
Rh-negative patients can react to Rh-positive blood, so they should only receive Rh-negative blood. Rh-positive patients can receive either. This is why O-negative is the universal donor — it is compatible with all ABO types and Rh factors.

Interpret carefully

Outputs are decision-support estimates, not a substitute for professional judgment.

  • Treating Blood Type Compatibility output as a final professional diagnosis, quote, or legal determination
  • Entering approximate values when the result is sensitive to units or precision
  • Applying the FAQ answer (“What is the universal blood donor type?”) to a special case without checking assumptions

Next steps

  1. Double-check inputs against your source documents (labs, statements, specs, or notes).
  2. Confirm the method below matches your use case before you act on the number.
  3. For medical, financial, or production decisions, verify with a qualified professional.

Disclaimer: Results are informational only and do not constitute medical, financial, legal, or professional advice. Report issues: sublimernj@gmail.com

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