Blood Type Calculator – Predict Your Baby’s Blood Type
Enter both parents’ blood types to see all possible blood type outcomes for your baby. This calculator uses proven genetics rules to help you understand ABO and Rh factor combinations with clear, accurate predictions.
Blood Type Calculator
Select each parent’s blood type to estimate your baby’s possible blood type using our genetics-based calculator.
The child's blood type：
Chance for ABO System
ABO
A
B
AB
O
Chance
18.75%
18.75%
56.25%
6.25%
Chance for Rh Antigen
Rh
Rh+
Rh-
Chance
93.75%
6.25%
Blood Type Overview
Learn how your blood type is determined by the ABO system and Rh factor, and how genetics from both parents define possible blood types. This module explains the basics of blood groups, inheritance patterns, and Rh classification in a clear, easy-to-understand way.
The ABO System
Blood type is determined by A and B antigens on red blood cells. The four main groups are A, B, AB, and O. A and B are dominant, while O is recessive, only appearing if both alleles are O. • Dominance Matters : Only OO alleles produce blood type O. • Four Main Groups: A, B, AB, and O, each with unique antigen combinations.
Genetic Inheritance
Each person inherits two alleles, one from each parent. Combinations determine blood type, explaining why children may differ from their siblings. • Allele Combinations : A → AA/AO, B → BB/BO, AB → AB, O → OO. • Predictable Patterns : Parent combinations affect probabilities of a child’s blood type.
The Rh Factor
Blood is classified as Rh+ or Rh− based on the Rh(D) antigen. Rh− is recessive, so two Rh− parents always have an Rh− child. Together with ABO, this defines the full blood type. • Rh Inheritance : Two Rh− parents cannot have an Rh+ child. • Complete Type : ABO + Rh factor = full blood type (e.g., A+, O−).
How to Calculate Baby‘s Blood Type
The Calcuflare Blood Type Calculator predicts your child’s possible blood types by combining parental ABO and Rh alleles. It uses genetic principles to calculate all potential outcomes and their probabilities, providing results instantly without manual calculations.
For example, if your blood type is A and your partner’s blood type is AB: Determine your alleles • Blood type A can have genotype AA or AO. • Your child could inherit an A allele (75% chance) or an O allele (25% chance). Determine your partner’s alleles • Blood type AB corresponds to genotype AB. • Your child could inherit an A allele (50% chance) or a B allele (50% chance). Combine probabilities • Multiply the chances from each parent to calculate possible genotypes: AA: 75% × 50% = 37.5% AB: 75% × 50% = 37.5% AO: 25% × 50% = 12.5% BO: 25% × 50% = 12.5% • Add results for the same blood type: A = AA + AO = 50% B = BO = 12.5% AB = AB = 37.5% Rh factor calculation • If both parents are Rh+, the child has a 93.75% chance of Rh+ and 6.25% chance of Rh−. • If both parents are Rh−, the child will be 100% Rh−. • If one parent is Rh+ and the other Rh−, the child has a 75% chance of Rh+ and 25% chance of Rh−.
How to Use Calcuflare's Blood Type Calculator
Follow these simple steps to instantly see your baby’s possible blood type based on both parents’ blood types.
Select Parents’ Blood Types
Choose the mother’s and father’s blood types from the dropdown lists, including both ABO and Rh factors.
Get Instant Results
The calculator automatically analyzes genetic combinations as soon as both blood types are selected—no clicks needed.
View Possible Blood Types
Instantly see all potential blood type outcomes and probabilities for your baby, clearly displayed on the screen.
Child Blood Type Inheritance Table
This table shows typical parent blood type combinations and all possible ABO outcomes for their children. It helps visualize how inheritance rules determine blood type probabilities.
| Parents | A | B | AB | O |
|---|---|---|---|---|
| A × A | 93.75% | 0% | 0% | 6.25% |
| A × B | 18.75% | 18.75% | 56.25% | 0% |
| A × O | 75% | 0% | 0% | 25% |
| B × B | 0% | 93.75% | 0% | 6.25% |
| B × O | 0% | 75% | 0% | 25% |
| O × O | 0% | 0% | 0% | 100% |
| AB × A | 50% | 12.5% | 37.5% | 0% |
| AB × B | 12.5% | 50% | 37.5% | 0% |
| AB × AB | 25% | 25% | 50% | 0% |
| AB × O | 50% | 50% | 0% | 0% |
Child Rh Factor Inheritance Table
Check the chances of your child being Rh positive or Rh negative based on different parent Rh type combinations. This table covers the common parental pairings for easy reference.
| Parents | Child Rh+ | Child Rh− |
|---|---|---|
| Rh+ × Rh+ | 93.75% | 6.25% |
| Rh+ × Rh− | 75% | 25% |
| Rh− × Rh− | 0% | 100% |
Blood Type Prevalence Table
Discover how common each blood type is in the population. This table shows the percentage of A, B, AB, and O blood types, along with the distribution of Rh-positive and Rh-negative individuals. It helps you understand the relative rarity of each blood type at a glance.
| Blood Type | Rh+ | Rh− | Total |
|---|---|---|---|
| O | 37% | 2% | 39% |
| A | 28% | 6% | 34% |
| B | 20% | 2% | 22% |
| AB | 4% | 1% | 5% |
| Total | 89% | 11% | 100% |
Note: These percentages represent global averages. Blood type prevalence can vary by region.
Explore More Health Calculators
Explore more family, genetics, fertility, and health calculators to predict traits, track timelines, and understand key life milestones.
Predict Your Baby’s Blood Type
Quickly see all possible blood types your child may inherit. Simple, accurate, and instant results.
FAQs of Blood Type Calculator
Find answers to common questions about blood types, inheritance, and Rh factor using the Calcuflare‘s Blood Type Calculator. Learn how the calculator works and what the results mean for your child.
Can my child have a different blood type than both parents?
Yes. Depending on the combination of alleles inherited from each parent, a child may have a blood type that differs from either parent. For example, two parents with type A (AO) could have a child with type O.
What does the Rh factor mean?
Rh factor indicates the presence (Rh+) or absence (Rh−) of a specific protein on red blood cells. It’s important for pregnancy and blood transfusions.
How accurate is the Blood Type Calculator?
The calculator predicts probabilities based on genetic principles (ABO + Rh inheritance). It gives possible outcomes, not a guaranteed result.
If the father is A (AO) and the mother is B (BO), what blood type could my child have?
The child could inherit the following blood types based on allele combinations: A: 25%, B: 25%, AB: 25% ,O: 25%. Each parent contributes one allele. The father can pass A or O, the mother can pass B or O. Combining these gives all four possible outcomes with equal probability.
What if my child’s blood type doesn’t match the calculator’s results?
The calculator shows possible probabilities based on genetics, but it cannot guarantee the exact outcome. Variations can occur due to rare genetic mutations, typing errors, or unaccounted factors. If you are concerned, it’s best to consult a doctor or have your child’s blood type tested in a clinic.
Are blood type distributions the same worldwide?
No. Blood type percentages vary by region. For example, O+ is very common in the Americas, while B types are more prevalent in Asia. Local populations have different frequencies due to genetics and ancestry.