Blood Type Calculator
Predict possible child blood types from parents, or determine possible parent combinations from child blood type
Possible Child Blood Types
Select blood types and click Calculate
What is Blood Type Inheritance?
Blood type inheritance follows Mendelian genetics. The ABO blood type is determined by three alleles (A, B, O) on chromosome 9, where A and B are dominant and O is recessive.
The Rh blood system is another important classification. Rh positive is dominant and Rh negative is recessive. Parents' blood type combinations determine possible child blood types, but cannot determine a single definitive type.
How to Use
- Select calculation mode: Parents → Child or Child → Parents
- Choose whether to include Rh blood type system
- Select the blood types for parents or child
- Click Calculate to see the results
Inheritance Rules
ABO Blood Type Inheritance Rules
Types A and B are dominant, Type O is recessive. Genotypes AA and AO express as Type A, BB and BO as Type B, AB as Type AB, and OO as Type O.
Rh Blood Type Inheritance Rules
Rh positive is dominant and Rh negative is recessive. If both parents are Rh negative, the child must be Rh negative. If one parent is Rh positive, the child can be either Rh positive or negative.
FAQ
Q: Are the blood type calculations accurate?
A: The blood type calculator is based on genetic principles and provides theoretical possibilities. Actual blood types may differ due to rare cases like genetic mutations. Please get a medical test for confirmation.
Q: Why do some combinations have different probabilities?
A: Probabilities depend on the parents' genotypes. For example, Type A blood can be AA or AO genotype, and different genotype combinations produce different probabilities for child blood types.
Q: Is Rh negative blood rare?
A: Yes, Rh negative blood is relatively rare. In Chinese Han population, it accounts for about 0.3-0.5%. In Caucasian populations, it's higher at about 15%.
Q: Can a child's blood type definitively determine parents' blood types?
A: No. A child's blood type can only rule out certain parent combinations but cannot uniquely determine them. For example, a Type O child's parents cannot be Type AB, but could be various combinations of Types A, B, or O.