Obstetrics calculators

Explore validated-style scores and utilities commonly used in Obstetrics. Follow links for full references, limitations, and the interactive calculator.

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Bishop Score Vaginal Delivery / Induction Calculator
Bishop score to assess cervical favorability for induction.
Labor & Delivery · Updated 4/13/2026
Conception Date Calculator
Estimates conception date from expected due date using standard gestational timing.
Pregnancy · Updated 4/13/2026
Fetal Biophysical Profile (BPP) Score
Fetal surveillance biophysical profile score.
Pregnancy Calculators · Updated 4/13/2026
Fetal echo z-scores (Ped(z)-style)
Z-scores for fetal aortic/pulmonary valve annuli, LVEDD, RVEDD, and cardiac circumference from menstrual age and/or BPD/femur length. Ped(z) cites Lee 2010; this tool embeds Schneider 2005 ln–ln (valves/LV/RV), Traisrisilp 2011 (circumference vs GA/BPD), and Kim 2016 median biometry cross-check (PMC4796092). Not affiliated with pedz.de.
Maternal Fetal Medicine · Updated 4/16/2026
Infant Scalp Score
Predictive score for operative vaginal delivery success.
Risk Scores · Updated 4/13/2026
Modified Bishop Score (Vaginal Delivery Induction)
Cervical favorability scoring for labor induction.
Risk Scores · Updated 4/13/2026
Vaginal Birth After Cesarean (MFMU)
Race-free logistic success estimate (Grobman / MFMU network update) from age, height, pre-pregnancy weight, prior delivery history, arrest indication, and treated hypertension.
Pregnancy Calculators · Updated 4/13/2026
VBAC Risk Score for Successful Vaginal Delivery (Flamm Model)
Admission score predicting trial of labor after cesarean success (historical cohorts).
Pregnancy Calculators · Updated 4/13/2026

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