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 4/19/2026
Conception Date Calculator
Estimates conception date from expected due date using standard gestational timing.
Pregnancy · Updated 4/19/2026
Fetal echo z-scores (Ped(z)-style)
Fetal cardiac z-scores (valves, LVEDD/RVEDD, circumference) vs menstrual age or BPD/femur length. Ped(z) cites Lee 2010; embedded Schneider 2005 ln-ln, Traisrisilp 2011 CC, Kim 2016 biometry cross-check. Not affiliated with pedz.de.
Maternal Fetal Medicine · Updated 4/19/2026
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 4/19/2026
VBAC Risk Score for Successful Vaginal Delivery (Flamm Model)
Admission score predicting trial of labor after cesarean success (historical cohorts).
Pregnancy Calculators · Updated 4/19/2026

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