Stillbirth Risk Awarness Calculator
Educational estimate, not a diagnosis
Stillbirth Risk Awareness Calculator
The large majority of pregnancies end in a live birth. This tool combines a baseline population rate with a small set of well-studied risk factors to show roughly how your own profile compares to average — as a starting point for a conversation with your midwife or doctor, not a prediction of what will happen in your pregnancy.
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Estimated risk: — (about —)
Population baseline used: —
What moved this estimate
This range comes from multiplying average risk ratios together, which is a simplification — real risk factors interact rather than stack neatly, and this tool cannot see your scans, growth measurements, or test results the way your care team can. Treat this as a conversation starter, not a forecast.
How this estimate is built, and its sources
Baseline. Defaults to 0.57% (about 1 in 175), close to recent U.S. and other high-income-country stillbirth rates. You can adjust it to match local data for your country or region.
Factor weights used (multiplied against the baseline, then capped — see below):
- Age 35–39: ×1.5 | Age 40+: ×2.0
- BMI 25–29.9: ×1.2 | BMI 30–39.9: ×1.6 | BMI 40+: ×2.2
- Smoking: ×1.4
- Chronic hypertension: ×2.0
- Pre-existing diabetes: ×2.5 | Gestational diabetes: ×1.3
- Previous stillbirth: ×3.0
- First pregnancy: ×1.15
- IVF / ART conception: ×1.3
- Regular alcohol use: ×1.2
To avoid implausible compounding when several factors are selected, the combined multiplier is capped between ×0.85 and ×3.5, and the resulting percentage is additionally capped at 6% with a note if it’s reached, since simple multiplication becomes unreliable well before that point.
Sources: Flenady et al., Lancet 2011, major risk factors for stillbirth in high-income countries; Marufu et al. 2015 meta-analysis on smoking and stillbirth; systematic reviews on maternal BMI and stillbirth risk; population registry studies on diabetes and chronic hypertension as stillbirth risk factors; meta-analyses on stillbirth recurrence risk (pooled odds ratios roughly 2.3–4.8). This tool is not affiliated with any of these studies’ authors; figures are simplified for public education.
Scope: built for singleton pregnancies. It does not account for multiple pregnancy, fetal growth scans, Doppler studies, infection, congenital conditions, or intrapartum factors — all of which a clinician weighs directly and which matter more than anything a self-entered calculator can capture.
If you’ve experienced a loss
Reading about stillbirth risk can be difficult if it’s touched your life already. You don’t have to use this calculator. Organizations that offer information and bereavement support include Share Pregnancy & Infant Loss Support and Star Legacy Foundation in the U.S., or your local maternity service or baby-loss charity elsewhere.