ObCalc3.2.0 - App Store

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
. VBAC at Delivery Admission Success Calculator - Grobman MFMU model

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.

Version History Ready for iPhone Duo 3.2.0+1 11h ago Added minor improvements and acknowledgements 3.1.1+2 Sep 27 • Added new tool for VBAC at Delivery Admission
• Added ability to set app wide preferred units
• Added more units of measurement 3.1.0+4 Sep 15 Fixes some minor display issues in number inputs. 3.0.3 Sep 9 This update adds five new tools and rebuilds two:

NEW
• CMQCC Sepsis Screen — the two-step vital-sign/WBC and end-organ-injury screen, alongside the existing qSOFA/Sepsis-3 assistant (now labeled Maternal Sepsis Assistant to avoid confusion with this new tool)
• Life-Limiting Skeletal Dysplasia Screen
• Nuchal Translucency Percentile
• VTE Anticoagulation Dosing (ACOG PB 196)
• Intrauterine Transfusion (IUT) Volume Calculator

UPDATED
• VBAC Success Calculator — refreshed Grobman model implementation
• Fetal Biometry Suite — expanded panels and reference data

Thanks for the detailed clinical feedback that shaped this release — keep it coming. 3.0.2 Sep 2 * Bug fixes 2.3.2 01/16/2020 New calculators:
* CVR Calculator
* Extremely Preterm Birth Outcome
* MCA Peak Systolic Velocity

Added a new main screen with a searchable list of calculators.

Fixes issues found in the Fetal Biometry calculator. 2.3.1 12/11/2019 The latest version contains bug fixes. 2.2 06/20/2019 * Added new calculator cfDNA PPV/NPV Calculator
* Added tablet support
* Simplified interface for more unified appearance 2.1 05/17/2019 All new redesigned interface!

Added 4 new calculators: APGAR, Anion Gap, Date Difference, GDM Insulin.

Redesigned the Fetal Biometry calculator for more comprehensive use. 2.0 07/09/2018 1 04/29/2015