Maternal Obesity Obstetric Complication Risk Calculator

Estimate obstetric complication risk from pre-pregnancy BMI. Quantifies adjusted odds ratios for gestational diabetes, preeclampsia, cesarean, shoulder dystocia, macrosomia, postpartum hemorrhage, and VTE for BMI 30-50+.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Estimate obstetric complication risk from pre-pregnancy BMI. Quantifies adjusted odds ratios for gestational diabetes, preeclampsia, cesarean, shoulder dystocia, macrosomia, postpartum hemorrhage, and VTE for BMI 30-50+

Each component has a specific meaning:

  • Pre-pregnancy BMI — The pre-pregnancy bmi recorded for the scenario being assessed.

Note: Interpret the maternal obesity ob risk result against the thresholds and context described above.

How to Use

Enter the pre-pregnancy BMI for the scenario you are assessing. Estimate obstetric complication risk from pre-pregnancy BMI. Quantifies adjusted odds ratios for gestational diabetes, preeclampsia, cesarean, shoulder dystocia, macrosomia, postpartum hemorrhage, and VTE for BMI 30-50+. Use the maternal obesity ob risk result to inform your calculation.

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Frequently Asked Questions