Obstetrum: OB-GYN Calculator

Clinical obstetric calculators for healthcare professionals — updated 2026. Gestational dating (ACOG CO 700), estimated fetal weight, fundal height, gestational weight gain, fetal Doppler, Bishop score and VBAC prediction. 100% local data. Most obstetric calculator apps on the market stopped being updated between 2014 and 2021. Obstetrum keeps its tools aligned with current international guidelines (ACOG, WHO, FIGO, NICE, INTERGROWTH-21st). PRENATAL CARE • Gestational age — ACOG CO 700 dating hierarchy (IVF > 1st trim CRL USG > LMP > 2nd/3rd trim USG) • Estimated fetal weight — Hadlock 1991, INTERGROWTH-21st percentiles (p3–p97) • Fundal height — INTERGROWTH-21st, weeks 13–40, serial trend curve • Gestational weight gain — IOM guidelines by pre-pregnancy BMI • Fetal Doppler — Umbilical fluxometry, resistance indices, FGR staging LABOR AND DELIVERY • Bishop score — Score 0–13 and cervical favorability • Labor progress — Stage diagnosis and management support • VBAC predictor — Grobman 2007, updated Grobman 2021, and Flamm-Geiger CLINICAL RECORDS & PDF Patient calculation history, professional PDF reports with plotted percentiles, record comparison, physician signature. PRIVACY Local SQLite database. No remote servers. No cloud sync. No mandatory accounts. PREMIUM • Unlimited records, PDF reports, record comparison, ad-free Not a regulated medical device. Clinical decision support tool for healthcare professionals. Always verify results against your institutional protocols and clinical judgment. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/