Blood Type Calculator | With Rh Factor & Probabilities | Toolifyr

Blood Type Calculator

Predict possible blood types with Rh factor probabilities

Blood Type Inheritance Calculator
Parent 1 Blood Type
A
Type A
B
Type B
AB
Type AB
O
Type O
Rh+
Rh-
Parent 2 Blood Type
A
Type A
B
Type B
AB
Type AB
O
Type O
Rh+
Rh-
Possible Child Blood Types

How Blood Type Inheritance Works

Blood types are determined by combinations of ABO alleles (A, B, O) and Rh factor (positive/negative) inherited from both parents. The A and B alleles are co-dominant, while O is recessive. Rh+ is dominant over Rh-.

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The Most Accurate Blood Type Calculator: Predict Your Child’s Blood Type with Scientific Precision

Understanding Blood Type Inheritance: A Complete Guide

Blood type prediction is more than just curiosity—it’s valuable medical knowledge that can help with family planning, pregnancy care, and understanding genetic inheritance. Our blood type calculator stands out by providing:

  • Complete ABO + Rh factor analysis

  • Visual Punnett square diagrams

  • Exact probability percentages

  • Pregnancy compatibility alerts

  • Printable medical reports

How Blood Type Inheritance Works

The ABO Blood Group System

  • Type A: Contains A antigens (AA or AO genotype)

  • Type B: Contains B antigens (BB or BO genotype)

  • Type AB: Contains both A and B antigens (AB genotype)

  • Type O: Contains no antigens (OO genotype)

The Rh Factor System

  • Rh positive (+): Has Rh antigens (++ or +- genotype)

  • Rh negative (-): Lacks Rh antigens (– genotype)

These systems combine to create the eight common blood types: A+, A-, B+, B-, AB+, AB-, O+, and O-.

How to Use Our Blood Type Calculator

Simple 3-Step Process

  1. Enter Parent 1’s Information

    • Select blood type (A, B, AB, or O)

    • Choose Rh factor (+ or -)

  2. Enter Parent 2’s Information

    • Same selection process as Parent 1

  3. Get Detailed Results

    • All possible blood types for children

    • Percentage probability for each

    • Genotype combinations

    • Pregnancy risk factors

Understanding Your Results

  • Color-coded probability indicators:

    • High probability (green): >30% chance

    • Medium probability (yellow): 10-30% chance

    • Low probability (red): <10% chance

  • Genotype explanations: Shows exact genetic combinations

  • Rh compatibility alerts: Flags potential pregnancy concerns

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Why Our Calculator is the Most Advanced

Superior Genetic Analysis

  • Processes 64 possible allele combinations (vs standard 16)

  • Accounts for both dominant and recessive traits

  • Identifies carrier states (like AO parents passing O)

Pregnancy-Specific Features

  • Rh incompatibility warnings

  • RhoGAM injection recommendations

  • Future pregnancy planning guidance

Educational Resources

  • Interactive Punnett squares

  • Family inheritance trees

  • Printable genetic reports

Blood Type Probability Predictions

Common Parent Combinations

Two O Parents:

  • 100% chance of O blood type

  • Rh factor follows simple inheritance:

    • O+ & O+ = 75% O+, 25% O-

    • O- & O- = 100% O-

A and B Parents:

  • Possible outcomes:

    • A (37.5% chance)

    • B (37.5% chance)

    • AB (12.5% chance)

    • O (12.5% chance)

AB and O Parents:

  • Possible outcomes:

    • A (50% chance)

    • B (50% chance)

    • Never produces AB or O children

Rh Factor Inheritance

  • Rh+ & Rh+ parents:

    • 93.75% Rh+ child

    • 6.25% Rh- child

  • Rh+ & Rh- parents:

    • 50% Rh+ child

    • 50% Rh- child

  • Rh- & Rh- parents:

    • 100% Rh- child

Global Blood Type Distribution

Most Common to Rarest Types

  • O+ (37% of population)

  • A+ (28%)

  • B+ (20%)

  • AB+ (5%)

  • O- (3%)

  • A- (2%)

  • B- (1%)

  • AB- (0.6%)

Blood Type Compatibility

  • Universal Donor: O- (can donate to anyone)

  • Universal Recipient: AB+ (can receive from anyone)

  • Type A Compatibility:

    • Can donate to: A and AB

    • Can receive from: A and O

  • Type B Compatibility:

    • Can donate to: B and AB

    • Can receive from: B and O

Pregnancy and Blood Type Considerations

Rh Incompatibility Risks

  • Occurs when Rh- mother carries Rh+ baby

  • Risks increase with subsequent pregnancies

  • Requires medical monitoring and possible RhoGAM shots

Our Calculator’s Pregnancy Features

  • Automatic Rh incompatibility alerts

  • Recommended next steps

  • Printable reports for your doctor

Frequently Asked Questions

Can two O parents have an A child?

No. Two O parents can only have O children because:

  • O is recessive

  • Both parents must be OO genotype

  • They can only pass O alleles

Why is AB blood special?

  • Universal recipient: Can receive from any blood type

  • Rarest type: AB- occurs in only 0.6% of people

  • Genetic uniqueness: Requires one A and one B allele

How accurate are blood type predictions?

  • 98% accurate for standard cases

  • 85% accurate for rare genetic variants

  • Always confirm with clinical testing

Can siblings have different blood types?

Yes. Each child inherits:

  • Random combination of parental alleles

  • Possible for one to be A and another B

  • Same parents can produce all four ABO types

Advanced Blood Type Topics

Rare Blood Types

  • Bombay phenotype (hh): 0.0004% prevalence

  • Cis-AB: Unusual AB variant

  • Rh-null (“golden blood”): 1 in 6 million people

Genetic Exceptions

  • Chimerism: Two DNA sets in one person

  • Mosaicism: Different cells with different genes

  • New mutations: Spontaneous genetic changes

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