Blood Type Calculator

Blood Type (ABO & Rh) Calculator

Estimate possible child blood types from parents’ ABO and Rh factors

Live

Enter parents’ blood types

👩‍🍼 Mother blood type

Pick the full type (ABO + Rh). Leave blank to clear results.

👨‍🍼 Father blood type

ABO rules: A/B codominant, O recessive. Rh: + dominant over −.

Results

Chance for type A

—%

Chance for type B

—%

Chance for type AB

—%

Chance for type O

—%

Chance for Rh+

—%

Chance for Rh−

—%

Select both parents to see probabilities instantly.

Action

Educational tool only — real genotype frequencies vary by population.

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