Visualise how a recessive condition may pass from parents to children.
The Inheritance Probability Calculator is an educational tool that illustrates how inherited conditions can be passed from parents to their children.
It helps families and students understand the chances involved when both parents carry the same recessive gene, turning an abstract idea into a simple, visual outcome.
An educational tool, not a diagnosis
This calculator needs the known genetic status of both parents. It cannot estimate carrier or affected status, or infer a genotype from relationship or population data. These pages can help:
Many inherited conditions are recessive. A child is usually affected only when they inherit two changed copies of a gene, one from each parent. When both parents are carriers, each pregnancy has the same set of chances, no matter what happened before.
What this tool shows
The tool shows the general, statistical chances of inheritance when the parents’ carrier status is known.
What the results mean
The results are probabilities for each pregnancy, a way to understand risk in general terms.
What the results do not mean
They do not diagnose anyone, do not predict what will actually happen in a specific family, and are not a substitute for genetic testing or counselling.
Educational tools, not medical advice
