Blood type calculator helps users estimate a child’s possible ABO and Rh blood types from the mother’s and father’s blood types. It is useful for educational genetics questions, family curiosity, and basic inheritance understanding. Users select the full blood type for each parent, including both ABO group and Rh factor, and the calculator returns probability-style outputs for type A, B, AB, O, Rh positive, and Rh negative.
Blood Type (ABO & Rh) Calculator
Estimate possible child blood types from parents’ ABO and Rh factors
Enter parents’ blood types
Pick the full type (ABO + Rh). Leave blank to clear results.
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.