Maternal Age Risk Calculator
Estimate age-related pregnancy risks including chromosomal abnormality rates, miscarriage probability, and complication risks.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Down Syndrome Risk (1 in N)
940
Miscarriage Risk
15%
How to Use This Calculator
- Enter Maternal Age, BMI, and First Pregnancy (0=No, 1=Yes).
- Set Pre-Existing Conditions (0-3).
- Review Down Syndrome Risk (1 in N) and Miscarriage Risk (%).
- Use Down Syndrome Risk (%) and Any Chromosomal Abnormality (1 in N) to inform your decision.
How the result changes with Maternal Age
| Maternal Age | Down Syndrome Risk (1 in N) | Miscarriage Risk |
|---|---|---|
| 21 | 1,340 | 10% |
| 29 | 940 | 12% |
| 39 | 85 | 25% |
| 47 | 15 | 65% |
What each input means
- Maternal Age
- Your age at expected delivery date.
- BMI
- Pre-pregnancy body mass index. BMI >= 30 increases several risks.
- First Pregnancy (0=No, 1=Yes)
- First pregnancies carry higher preeclampsia risk.
- Pre-Existing Conditions (0-3)
- Number of relevant pre-existing conditions (hypertension, diabetes, thyroid disorder, etc.).
What each result means
- Down Syndrome Risk (1 in N)
- Down syndrome risk expressed as 1 in N live births at your age.
- Down Syndrome Risk
- Down syndrome probability as a percentage.
- Any Chromosomal Abnormality (1 in N)
- Risk of any chromosomal abnormality (estimated ~1.5x Down syndrome rate).
- Miscarriage Risk
- Age-adjusted first-trimester miscarriage risk (from large registry studies).
- Gestational Diabetes Risk
- Estimated gestational diabetes risk based on age and BMI.
- Preeclampsia Risk
- Estimated preeclampsia risk based on age, BMI, and parity.
- Cesarean Delivery Rate
- Average cesarean section rate for your age group.
- Monthly Fertility Rate
- Approximate monthly chance of natural conception (fecundity rate).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMaternal Age = 30, BMI = 24, First Pregnancy (0=No, 1=Yes) = 0, Pre-Existing Conditions (0-3) = 0 = 4 input(s) provided
- Calculate Down Syndrome RiskDown Syndrome Risk940 = 940
- Calculate Miscarriage RiskMiscarriage Risk15 = 15
- Calculate Down Syndrome Risk0.11 = 0.11
- Calculate Any Chromosomal AbnormalityAny Chromosomal Abnormality627 = 627
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.
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