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Blood Type Calculator — Free Online Tool
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Blood Type Calculator

Predict child blood group and Rh factor probabilities based on parents' blood types

Genetics Overview: Blood type inheritance follows ABO gene codominance and Rh factor (positive allele is dominant over negative). Select parents' blood groups below.
Parents' Blood Types Input

Calculation Results

⚠️ Not medical advice. For educational and genetic exploration purposes only. Paternity or maternity verification should not rely solely on blood type inheritance. Consult a genetic counselor or physician for clinical determinations.

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