Health

Blood Type Predictor

Find out the possible ABO blood groups and Rh factor for a child using both parents' blood types.

Mother's Blood Type

Group

Rh Factor

Father's Blood Type

Group

Rh Factor

Possible Child Blood Types

Method

How this calculator works

Mendelian Inheritance (Punnett Square logic for ABO and Rh genes)

Select the biological mother's blood group (A, B, AB, O).
Select the mother's Rh factor (+ or -).
Do the same for the biological father.
The calculator uses Mendelian genetics to predict all possible blood types for the child.

Examples

Worked examples

Real numbers, end-to-end results.

Mother: A+, Father: B+

Child can be A, B, AB, or O (all + or -)

All combinations are possible because A and B parents might carry the recessive O gene.

Use cases

When to use it

Learn what blood type your future child might have.
Understand genetics and blood group inheritance.

Disclaimer: This calculator provides estimates for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for decisions affecting your health. Results depend on the accuracy of inputs provided.

FAQ

Frequently asked questions

How does blood type inheritance work?

Blood type is determined by alleles inherited from both parents (A, B, and O). A and B are dominant, while O is recessive.

What is the Rh factor?

The Rh factor determines if your blood type is positive (+) or negative (-). Positive is dominant, so if both parents are negative, the child must be negative. If at least one parent is positive, the child can be either.