Child Blood Type Calculator

Predict possible blood types for a child based on parents' types.

Select both parents' blood types.

Based on standard Mendelian genetics for ABO and Rh factor inheritance. Does not account for rare genetic variations.

Predicting Your Child's Blood Type

A child inherits one gene for blood type (A, B, or O allele) and one gene for Rh factor (+ or - allele) from each biological parent. Knowing the parents' blood types allows you to predict the possible blood types their child could have.

This calculator determines the potential ABO blood groups (A, B, AB, O) and Rh factor outcomes (Positive +, Negative -) based on Mendelian genetics.

How to Use

  1. Select the complete blood type (including Rh factor) for Parent 1 from the dropdown.
  2. Select the complete blood type for Parent 2.
  3. Click "Predict Child's Blood Types".

The results will list all possible blood types (ABO group and Rh factor combination) that a biological child of these two parents could inherit.

Genetics Basics

  • ABO System:** Genes A and B are dominant over O. If you inherit A from one parent and O from the other, your type is A. If you inherit A and B, your type is AB. Type O requires inheriting O from both parents.
  • Rh Factor:** The positive allele (+) is dominant over the negative allele (-). You only have Rh-negative blood if you inherit the negative allele from both parents.

Example

If Parent 1 is A+ (genotype could be AA++ / AA+- / AO++ / AO+-) and Parent 2 is B+ (genotype could be BB++ / BB+- / BO++ / BO+-), their child could potentially have any ABO type (A, B, AB, or O) and either Rh+ or Rh- blood, depending on the specific recessive genes carried by the parents.

Disclaimer:** This tool assumes standard inheritance patterns and does not account for rare genetic mutations or complex scenarios. It's for informational purposes and cannot replace actual blood typing.