# ObCalc

> OB/MFM Clinical Calculators

Canonical page: [https://chrome-stats.com/d/id983427276](https://chrome-stats.com/d/id983427276)

## Overview

- **ID:** `id983427276`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Code Nine Labs LLC
- **Category:** Medical
- **Version:** 3.1.0+4
- **Last updated:** 2026-09-15
- **First published:** 2015-05-03
- **Size:** 2.77 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/obcalc/id983427276)
- **Website:** [https://apps.codeninelabs.com/obcalc](https://apps.codeninelabs.com/obcalc)
- **Privacy policy:** [https://obcalc.codeninelabs.com/privacy.html](https://obcalc.codeninelabs.com/privacy.html)

## Description

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.

## Rankings

- #1,065,139 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id983427276)