How is ABO blood type inherited?

ABO blood type is determined by A, B, and O alleles. A and B are dominant, O is recessive. Each parent contributes one allele, forming the child's blood type.

How is Rh factor inherited?

Rh factor is determined by D antigen. Rh+ is dominant, Rh- is recessive. At least one Rh+ parent means child could be Rh+; only two Rh- parents guarantee Rh- child.

Are there exceptions?

This calculator uses classical genetics. Rh- mothers with Rh+ fetuses may need medical attention. Rare genetic variants can produce different results.

Blood Type Inheritance Calculator - ABO & Rh

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Predict child blood types from parents

Health

Father ABO Type

Father Rh Factor

Mother ABO Type

Mother Rh Factor

Possible Child Blood Types

💡 ABO: A and B dominant, O recessive. Rh+ dominant, Rh- recessive.

What is Blood Type Inheritance Calculator - ABO & Rh?

Blood Type Inheritance Calculator - ABO & Rh is a free online tool that runs entirely in your browser. No download or signup needed — select the Father and Mother ABO type and Rh factor to see the possible blood types of the child. All data is processed locally.

Use Cases

Understand how ABO and Rh blood types are passed from parents to children
Learn about dominant and recessive allele inheritance for the ABO system
Plan ahead when studying biology or preparing for school projects
Get a quick reference for possible child blood types during discussions

Key Features

Completely Free: No registration, no limits
Privacy Safe: Data never leaves your browser
Cross-Platform: Any modern browser
Zero Dependencies: Open and use

🩸 Blood Type Calculator

Possible Child Blood Types

What is Blood Type Inheritance Calculator - ABO & Rh?

Use Cases

Key Features

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