Blood Type Calculator
See which blood types a child could inherit from two parents.
Awaiting Data
Enter your details and tap Calculate to see your results appear here.
Your result appears here.
What it measures
Blood type passes from parents to children through simple genetics. The ABO system carries three alleles, A, B, and O, while the Rh system adds a positive or negative sign. Each parent hands down one ABO allele and one Rh signal.
This tool lists every blood type a child could inherit from the pair you pick. Results show possibilities, not certainties, since one parent can carry a hidden O or negative gene. Curious about your own count? Try the Blood Volume Calculator.
How to use this calculator
- Pick the first parent's blood group and Rh.
- Pick the second parent's blood group and Rh.
- Tap Calculate to see the possible child types.
The formula used
- ABO
- A, B, AB, or O.
- Rh
- Positive or negative.
Understanding Your Results
Tips to Improve
- Use this for learning, not for proof of parentage.
- A hidden O gene widens the options.
- Rh negative needs both parents to carry it.
- Ask a lab for a definitive result.
Frequently Asked Questions
No. Two O parents can only have an O child.
Yes, if both carry a hidden negative gene.
No. Only DNA testing can confirm parentage.
Scientific References
- Dean, L. (2005). Blood Groups and Red Cell Antigens. National Center for Biotechnology Information.
- American Red Cross. (2024). Blood Types.