Blood Type Calculator
Predict your baby's possible blood types using Mendelian genetics.
If both parents are Rh-, baby will be Rh-. Otherwise, baby can be Rh+ or Rh-.
Blood Type Genetics Explained
Blood type is determined by the ABO gene on chromosome 9. Everyone inherits one allele from each parent. The A and B alleles are co-dominant (both express), while O is recessive.
How ABO Inheritance Works
Type A blood can be genetically AA or AO. Type B can be BB or BO. Type AB is always AB (one A from one parent, one B from the other). Type O is always OO (recessive O from both parents). This creates interesting possibilities — for instance, an A parent and B parent can have children of ALL four blood types.
The Rh Factor
The Rh factor (+ or -) is determined by a separate gene. Rh+ is dominant, so a person with one Rh+ allele and one Rh- allele will be Rh+. Rh incompatibility occurs when an Rh- mother carries an Rh+ baby. Modern medicine handles this with RhoGAM injections during pregnancy.
Blood Type Distribution
In the US: O+ (37%), A+ (36%), B+ (9%), AB+ (3%), O- (7%), A- (6%), B- (2%), AB- (1%). O- is the universal donor and AB+ is the universal recipient.
Mendelian Inheritance (Punnett Square)
Each parent randomly contributes one of their two ABO alleles. The combination of these two alleles determines the child's blood type.
Manual Step: Calculating for A+ and B- Parents
Let's trace the possible outcomes if Parent 1 is A+ (Genotype AO, Rh +/-) and Parent 2 is B- (Genotype BO, Rh -/-).
Inheritance Examples
A × B Parents
Frequently Asked Questions
Can two O parents have an A or B child?
Can two A parents have a type O child?
What is the Rh factor?
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Frequently Asked Questions
How accurate is the Blood Type Calculator?
Is my data stored or tracked?
How frequently is this tool updated?
Sources & Citations
- Standard Mathematical Algorithms— IEEE Computation Standards
- Data Integrity & Local Processing Guidelines— W3C
- General Mathematical Verification— National Institute of Standards and Technology (NIST)
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