Predict your child's possible blood types based on parents' blood types. Includes ABO group and Rh factor inheritance with probability percentages.
Select both parents' blood types to see the prediction.
| Parent 1 | Parent 2 | Possible Child Types |
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Blood type is determined by genes inherited from both parents. The ABO system has three alleles: A, B, and O. A and B are dominant over O, but are codominant with each other (resulting in AB). The Rh factor is determined by a separate gene, where positive (D) is dominant over negative (d).
No. Two O parents can only have a child with type O blood, because the O allele is recessive and both parents can only pass on O alleles.
No. Rh-negative means both alleles are negative (dd), so both parents can only pass on negative alleles. The child will always be Rh-negative.
This calculator provides probabilities based on standard Mendelian inheritance. In rare cases, mutations or other genetic factors may result in unexpected blood types. For definitive results, genetic testing is required.
The rarest ABO-Rh combination is AB-negative, found in less than 1% of the population globally. O-negative is also relatively rare but is the universal donor type, making it highly valuable for blood transfusions.