billycalc

Stillbirth Risk

Stillbirth Risk: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.

Stillbirth Risk

Mother's ageyears
Stillbirth rate (≥ 20 weeks) in the age group
5.01‰
Source: CDC/NCHS, Fetal Mortality: United States, 2022 (NVSR vol. 73 no. 9), table 4 — fetal deaths at 20 weeks or more per 1,000 live births plus fetal deathsThis is the average rate for all women of this age in the US, not a personal prediction: smoking, obesity, hypertension, diabetes, multiple pregnancy and the course of pregnancy all change the riskWHO defines stillbirth as fetal death from 28 weeks; to compare with WHO figures use the "28 weeks or more" rateStillbirth Risk: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
Age group (NVSR 2022)
30–34 years
As a percentage
0.501%
About 1 case per this many births
200
Fetal deaths at 20–27 weeks
2.56‰
Fetal deaths at 28 weeks or more
2.46‰
US average, all ages
5.48‰
Ratio to the US average
0.91

More about: Stillbirth Risk

What it calculates

The “Stillbirth Risk” calculator computes Stillbirth rate (≥ 20 weeks) in the age group in ‰ from 1 parameter: mother's age (years).

Used by professionals and patients to assess health metrics, dosages, and risks.

Example calculation

With parameters Mother's age = 30 years the result is 5.01 ‰ (Source: CDC/NCHS, Fetal Mortality: United States, 2022 (NVSR vol. 73 no. 9), table 4 — fetal deaths at 20 weeks or more per 1,000 live births plus fetal deaths).

How to use

  1. Enter mother's age — each field above is adjustable with a slider.
  2. Stillbirth rate (≥ 20 weeks) in the age group (‰) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.

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