ObCalc puts the calculators, scoring tools, and reference charts that obstetrics, maternal-fetal medicine, and labor & delivery teams reach for every shift into one fast, offline-first app.

Every formula is sourced to published guidelines (ACOG, SMFM, CMQCC, NICHD) and built as a clinical tool first — clean inputs, clear interpretation, no clutter.

OBSTETRICS
• Bishop Score
• Estimated Due Date — LMP, ultrasound, conception, ovulation, or IVF transfer dating
• Pregnancy Re-dating (ACOG Committee Opinion 700)
• Pregnancy Weight Gain Tracker
• Urine Protein:Creatinine Ratio (UPCR)
• VBAC Success Calculator — Grobman MFMU model with confidence interval

PERINATOLOGY / MFM
• CVR (CPAM Volume Ratio)
• Extremely Preterm Birth Outcome (NICHD)
• Fetal Biometry Suite — Hadlock EFW, long-bone ratios, multi-panel z-scores and percentiles
• Intrauterine Transfusion (IUT) Volume Calculator
• MCA Doppler / PSV for Fetal Anemia
• Neonatal Morbidity Risk
• Ponderal Index
• GDM Insulin Dosing
• Life-Limiting Skeletal Dysplasia Screen
• Twin Discordance
• Umbilical Artery Doppler

GENERAL
• Anion Gap • Apgar Score • BMI • Iron Deficit • Peak Flow
• Gestational Age (date difference)
• Maternal Sepsis Assistant (qSOFA / Sepsis-3)
• CMQCC Sepsis Screen

THROMBOPHILIA
• VTE Anticoagulation Dosing (ACOG Practice Bulletin 196)

GENETICS
• cfDNA PPV/NPV Calculator
• Nuchal Translucency Percentile

WHY CLINICIANS CHOOSE ObCalc
• Offline-first — no connection needed on L&D
• Fast, distraction-free interface — no ads, no tracking
• One-time purchase. No subscription, no account required
• Regularly updated with new tools and guideline changes
• Built-in unit conversion and inline number-pad arithmetic on every input

ObCalc is a clinical reference tool intended for use by licensed healthcare professionals. It does not replace clinical judgment, and results should be confirmed against current guidelines and your institution's protocols.