Autosomal Recessive Risk to a Pregnancy From Both Carrier Risks
Risk of an affected child for an autosomal recessive condition: partner A's carrier risk times partner B's, times 1/4.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Partner A's carrier risk
- 1
- Partner B's carrier risk
- 1 in 634
Result: Risk of an affected child: 1 in 2,536
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Partner A's carrier risk
- Partner B's carrier risk
How this is calculated
Citation
Stated arithmetic: Mendelian segregation, a 1 in 4 chance of an affected child when both parents are carriers, times each partner's probability of being a carrier.
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.