Blood Type Probability Calculator

Real-Time Blood Type Inheritance Predictor with Detailed Genotype Analysis

Real-Time Results
LIVE

Parental Blood Types

Parent 1
Parent 2

Blood Type Probability Results

Understanding the Results

This calculator predicts the possible blood types of offspring based on parental genotypes. Results update in real-time as you change input values.

ABO Blood Type Probability
Type A
0%
Possible genotypes: --
Type B
0%
Possible genotypes: --
Type AB
0%
Possible genotype: --
Type O
0%
Possible genotype: --
Rh Factor Probability
Rh Positive (+)

Probability of positive Rh factor

0%
Rh Negative (-)

Probability of negative Rh factor

0%

Detailed Genotype Analysis

Possible Genotype Probability Resulting Blood Type Inheritance Pattern
No data available. Please calculate probabilities.
Probability Summary

Enter parental blood types to see the probability summary of possible offspring blood types.

Understanding Blood Type Inheritance: A Comprehensive Guide

How Blood Type Inheritance Works

Blood type is determined by the ABO gene and the Rh factor. The ABO gene has three alleles: A, B, and O. A and B are dominant over O, but neither dominates the other (codominance).

ABO Blood Group System

The ABO blood group system classifies human blood into four main types: A, B, AB, and O. Your blood type is determined by the combination of alleles inherited from your parents:

  • Type A: Can have genotype AA or AO
  • Type B: Can have genotype BB or BO
  • Type AB: Has genotype AB (both A and B alleles expressed)
  • Type O: Has genotype OO (recessive)
Rh Factor Inheritance

The Rh factor (Rhesus factor) is another important blood group system. A person is either Rh positive (has the Rh antigen) or Rh negative (lacks the Rh antigen). The Rh positive allele is dominant over Rh negative.

Using the Blood Type Probability Calculator

Our real-time calculator uses Mendelian genetics principles to predict the probability of each possible blood type in offspring:

  1. Select the ABO blood type for each parent
  2. Optionally specify the exact genotype if known
  3. Select the Rh factor for each parent
  4. Click "Calculate Probability" to see real-time results
  5. View detailed genotype analysis and inheritance patterns
Practical Applications

Understanding blood type inheritance is important for:

  • Predicting possible blood types of future children
  • Medical planning and transfusion compatibility
  • Understanding genetic inheritance patterns
  • Paternity testing considerations
  • Genetic counseling and family planning
Did You Know?

The distribution of blood types varies by population. For example, Type O is the most common worldwide (around 45%), while Type AB is the rarest (around 5%).

Blood Type Distribution
Type O
45%
Type A
40%
Type B
11%
Type AB
4%
Quick Reference

Universal Donor: Type O-negative

Universal Recipient: Type AB-positive

Most Common: Type O-positive

Rarest: Type AB-negative

Note: These statistics represent global averages and may vary by region and ethnicity.