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ABO Blood Type Inheritance Calculator

Probability of each ABO blood type for a child.

Given the ABO genotype of each parent (AA, AO, BB, BO, AB, or OO), compute the probability that a child has each ABO blood type (A, B, AB, or O).

Priya Venkatesan By Priya Venkatesan
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

4-cell Punnett square reduced to phenotypes (A: AA/AO; B: BB/BO; AB: AB; O: OO).

In depth

Given the ABO genotype of each parent (AA, AO, BB, BO, AB, or OO), compute the probability that a child has each ABO blood type (A, B, AB, or O).