Hemophilia Inheritance Calculator

Fill in the details of parent’s hemophilia status in below calculator and find out your child’s possibility of inheriting hemophilia.

Child’s Hemophilia Probability Predictor

Select Hemophilia Status for Parents and Grandparents (if known)

This calculator provides an estimation of the likelihood that a child will inherit hemophilia, based on the genetic information of the parents and grandparents.

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Understanding Hemophilia

Hemophilia is a genetic disorder that impairs the body’s ability to control blood clotting or coagulation, which is used to stop bleeding when a blood vessel is broken.

It is characterized by deficiencies in clotting factors, specifically factor VIII (Hemophilia A) or factor IX (Hemophilia B), which are proteins essential for blood clotting.

The Genetics Behind Hemophilia

Hemophilia is mostly inherited in an X-linked recessive pattern. This inheritance pattern is crucial in determining the likelihood that a child will inherit hemophilia.

The disorder typically arises from mutations in the genes located on the X chromosome for factor VIII or factor IX which are responsible for producing blood clotting factors.

These mutation leads to insufficient production of the clotting factor, and the specific mutation is known as a hemophilia allele.

X-Linked Recessive Inheritance: Because the genes affected by hemophilia are on the X chromosome, and males (XY) have only one X chromosome, a single hemophilia allele will result in the disease. Females (XX), however, have two X chromosomes and typically must inherit two hemophilia alleles to exhibit severe symptoms, though they can be carriers without any symptoms if they inherit only one.

How Our Hemophilia Inheritance Calculator Works

  1. Enter Parental Genetic Information:
    • Mother’s Disease Status: Indicates whether the mother carries the hemophilia allele.
    • Father’s Hemophilia Status: Indicates whether the father has hemophilia.
  2. Calculation of Inheritance Probabilities:
    • The calculator uses this data to estimate the likelihood of genotype of mother from grandparents status and then based on that decide probability of hemophilia in children, detailing the chances for sons to inherit hemophilia and for daughters to be carriers.

Potential Outcomes Based on Parental Genes:

  • Sons: A son has a 50% chance of inheriting hemophilia if his mother is a carrier. The father’s status does not affect this probability as fathers pass the Y chromosome to their sons.
  • Daughters: A daughter will always be a carrier if her father has hemophilia because she inherits his X chromosome. If the mother is also a carrier, there is a 50% chance each daughter could be severely affected.

Medical and Practical Importance of Hemophilia Knowledge

Understanding the genetic risks for hemophilia is not only crucial for managing the condition through proactive treatments but also for making informed family planning decisions.

  • Treatment and Management: Early intervention with clotting factor replacement therapy can significantly enhance quality of life.
  • Family Planning: Families can better understand their risks and consider genetic counseling as part of their planning process.

Educational Role of the Calculator

This hemophilia predictor tool serves as a practical application of genetic education, simplifying the inheritance of X-linked recessive disorders like hemophilia. It helps individuals and families understand their genetic makeup, providing insights into potential health challenges.

Knowing the genetic risks for hemophilia can empower families to take proactive steps in healthcare and lifestyle adjustments, ensuring better preparedness and management of the disorder.

Disclaimer: This calculator offers an estimation based on common genetic inheritance patterns and average allele frequency of common mutation and should not replace professional medical advice.


Can a female have symptoms of hemophilia?

Yes, although rare, if a female inherits two hemophilia alleles or one allele with another X chromosome complication (i.e. X inactivation), she can exhibit symptoms as severe as those seen in males.

Is it possible for a son to be a carrier of hemophilia?

No, males cannot be carriers because they inherit only one X chromosome, which either has the hemophilia allele (resulting in the disease) or not.

How reliable are genetic predictions for hemophilia?

Predictions are generally reliable when based on established inheritance patterns, but unexpected new mutations can occasionally lead to deviations from typical genetic expectations.

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