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We use a transparent, published-evidence approach (see sources).
1) We start with an age-based baseline miscarriage probability (population data, see sources).
2) We convert baseline probability → odds, then multiply odds by published relative-risk / odds-ratio factors for each applicable factor (smoking, BMI category, prior miscarriage count, diabetes, hypertension, heavy alcohol).
3) Convert adjusted odds back → final probability and present a clear textual explanation and recommendations. This odds-multiplicative method is standard when combining independent risk factors in an evidence-based calculator.
The Miscarriage Risk Calculator is an evidence-based tool that estimates the probability of miscarriage up to 20 weeks of pregnancy. It uses age-based baselines and published risk multipliers (BMI, smoking, alcohol, prior losses, diabetes, hypertension) to provide an educational estimate. It is not medical advice.
This calculator applies peer-reviewed research, meta-analyses, and clinical guidelines to provide transparent estimates. It gives reliable population-level insights, but individual results vary. Always consult your clinician for personalized care.
Important factors include maternal age, BMI, number of prior miscarriages, smoking, alcohol, pre-existing diabetes, and chronic hypertension. These evidence-based factors modify the baseline miscarriage probability.
Yes. This calculator is for educational awareness and does not collect or store personal data. Results are for learning only and should not replace medical consultation.
Yes. Overweight and obesity are associated with higher miscarriage odds in multiple meta-analyses. The calculator applies conservative multipliers to reflect this risk while also recognizing when BMI is in the normal range.
Yes. Quitting smoking, limiting alcohol, maintaining a healthy BMI, and managing conditions such as diabetes or hypertension can improve pregnancy outcomes. While no tool can remove all risk, healthier habits reduce it significantly.
Yes. The Miscarriage Risk Calculator is completely free and designed for transparency, accessibility, and evidence-based education.
Data comes from ACOG (American College of Obstetricians and Gynecologists), BMJ population studies, Mayo Clinic, and other peer-reviewed meta-analyses and cohort research. This ensures accuracy and credibility.
No. The calculator only provides an estimated probability based on research data. Most pregnancies are successful even when risk factors exist. Speak to your doctor for personalized guidance.
This tool is for women who are pregnant or planning pregnancy and want to understand miscarriage risk factors. It is also useful for students, educators, and researchers looking for transparent evidence-based estimates.