# ObWheel

> Digital pregnancy wheel for calculating due dates and gestational age. (iPhone/iPad app by Michael Phang.)

- Source: https://appshunter.io/ios/app/obwheel/id1098426614 (this page in markdown: same URL + `.md`)
- Developer: [Michael Phang](https://appshunter.io/developer/979442205)
- Category: Medical, Health & Fitness
- Price: $0.99
- Rating: 3.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 12+
- Requires: iOS 10.0 · 19 MB
- Languages: American English
- Released: 2016-04-05
- Data updated: 2026-07-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/obwheel/id1098426614/reviews.md

## What is ObWheel?

ObWheel is a handy app that puts the traditional pregnancy dates wheel into the palm of your hand! ObWheel is useful for expectant parents as well as obstetricians, family physicians, nurses, midwives, and students. It uses the date of Last Menstrual Period (LMP) to calculate Estimated Due Date (EDD) and Gestational Age (GA). No more imprecise paper wheels - this tool is always at hand, in your pocket!

We've separated the outer and inner wheels to make this easy-to-use. Spin the green wheel to set the LMP date. Spin the purple wheel to browse important milestones, and to calculate the gestational age on a specific date (displayed in the middle).

Prefer to enter dates manually? No problem. Select "Set" and choose dates by LMP, EDD, or GA on a specific date. Use the "Info" screen to see important dates (trimesters, testing and windows) and information on fetal biometry reference ranges (Lessoway) based on current gestational age.

Need to calculate the EDD from a dating ultrasound report? Rotate the purple wheel until the GA shown matches the GA on the ultrasound report. Then, rotate the green wheel until the date matches the date of the ultrasound. The EDD will be displayed below. Alternatively, input the GA and ultrasound date manually in the "Set" screen.

ObWheel is a universal app and works on the iPhone and iPad! We are continually working to improve ObWheel, and appreciate your feedback.

## Key features

- Calculate Estimated Due Date (EDD)
- Calculate Gestational Age (GA)
- Track important pregnancy milestones
- Calculate EDD from ultrasound reports
- Manual date entry options
- View fetal biometry reference ranges

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/obwheel/id1098426614/reviews.md

### 1/5 — Warning-crashes upon use

*2020-08-25, version 2.0*

Seems great but once you try to set the date to see the detailed screen, it crashes back to the home screen.

### 5/5 — Does exactly what it says

*2019-11-13, version 2.0*

Nothing extra, perfect to determine a pregnancy due date and the dates of all trimester.

## Frequently asked questions about ObWheel

### How does ObWheel calculate the estimated due date?

ObWheel calculates the Estimated Due Date (EDD) by using the date of your Last Menstrual Period (LMP) as the primary input. You can spin the green wheel to set the LMP date, and the EDD will be displayed.

### Can ObWheel be used to determine gestational age at a specific date?

Yes, ObWheel allows you to calculate the Gestational Age (GA) on a specific date. By spinning the purple wheel, you can browse important milestones and see the corresponding gestational age displayed in the center.

### Does ObWheel support manual date entry?

Yes, ObWheel offers manual date entry options. You can select 'Set' and choose dates by LMP, EDD, or GA on a specific date, providing flexibility in how you input information.

### How can ObWheel help with ultrasound reports?

ObWheel can calculate the EDD from a dating ultrasound report. You can rotate the purple wheel to match the GA shown on the report and then rotate the green wheel to match the ultrasound date to find the EDD.

### What medical information does ObWheel provide?

The 'Info' screen in ObWheel displays important dates such as trimesters and testing windows. It also provides information on fetal biometry reference ranges based on the current gestational age.

### What devices is ObWheel compatible with?

ObWheel is a universal app, meaning it works on both iPhone and iPad devices. It is also supported on iPod.

### How often is ObWheel updated?

The latest version of ObWheel is 2.0, which was last updated on April 7, 2018. The developer is continually working to improve the app and welcomes user feedback.

### What is the price of ObWheel?

ObWheel is a paid application and costs $0.99. There are no in-app purchases or advertisements mentioned for this app.

## Version history (last 2 releases)

### 2.0 — 2018-04-07

This app has been updated by Apple to display the Apple Watch app icon.

Thanks for waiting patiently! ObWheel is a big feature update, including:
- Support for the iPhone X
- Ability to enter specific dates for LMP, EDD, or gestational age on a specific date
- A new info screen with commonly referenced dates
- Fetal biometry reference ranges based on gestational age (Lessoway)

### 1.0 — 2016-04-05

This update is signed with Apple’s latest signing certificate. No new features are included.

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## More apps by Michael Phang

- [BiliMatic](https://appshunter.io/ios/app/bilimatic/id979442206)

All apps by Michael Phang: https://appshunter.io/developer/979442205

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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 2026-07-01.*