# DrObsCalc — Intelligent GA & EDD Workflow

> Intelligent GA & EDD Workflow (iPhone/iPad app by Eng Loy Tan.)

- Source: https://appshunter.io/ios/app/drobscalc/id6759258402 (this page in markdown: same URL + `.md`)
- Developer: [Eng Loy Tan](https://appshunter.io/developer/1876155118)
- Category: Medical, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 11 MB
- Languages: English
- Released: 2026-02-27
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/drobscalc/id6759258402/reviews.md

## What is DrObsCalc?

DrObsCalc is a clinical gestational age calculator built for real clinical practice.

Establish gestation instantly from last menstrual period (LMP), estimated date of delivery (EDD), or known gestational age (GA) on a known date. The calculator adapts automatically, with no manual mode switching required.

Designed for obstetricians by an obstetrician, DrObsCalc supports fast, accurate workflow at the point of care.

Key Features:
• Intelligent input logic for LMP, EDD, or GA-based entry
• Automatic recalculation across related values
• Fast 6- or 8-digit numeric date entry
• Automatic regional date format recognition
• Clear trimester and milestone overview

Clinical Milestones Pro (One-Time Purchase):
• Additional clinical window presets
• Create and customise your own clinical window presets
• Custom Appointment Planning Weeks
• More tailored follow-up planning

DrObsCalc performs date calculations and clinical planning support only. It does not provide diagnostic or treatment recommendations.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Clinical Milestones Pro | $6.99 | one-time |



## Version history (last 3 releases)

### 1.5.0 — 2026-03-30

What’s New in Version 1.5.0

• Added Appointment Planning Weeks in Clinical Milestones Pro for clearer follow-up planning
• Refined milestone tools with updated Clinical Windows wording
• Refreshed About page information
• UI polish and bug fixes

### 1.1.0 — 2026-03-07

• Date entry now remembers your last used input method across LMP, EDD, and As of date.
• Minor usability improvements.

### 1.0 — 2026-02-27

No release notes.

## More apps by Eng Loy Tan

- [DrObsBuddy](https://appshunter.io/ios/app/drobsbuddy/id6758986244)

All apps by Eng Loy Tan: https://appshunter.io/developer/1876155118

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*