# Perfect OB Wheel — Obstetrics calculator

> Obstetrics calculator for pregnancy due dates and gestational age. (iPhone/iPad app by Evan Schoenberg.)

- Source: https://appshunter.io/ios/app/perfect-ob-wheel/id293656711 (this page in markdown: same URL + `.md`)
- Developer: [Evan Schoenberg](https://appshunter.io/developer/289039917)
- Category: Medical
- Price: $1.99 with in-app purchases
- Rating: 4.90/5 from 3,578 App Store ratings · 200 written reviews indexed
- Age rating: 17+
- Requires: iOS 13.0 · 14 MB
- Languages: Russian, German (Germany), Italian, Japanese, French (France), Chinese (Simplified, China), American English, European Portuguese, European Spanish, Arabic and 1 more
- Released: 2008-10-16
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/perfect-ob-wheel/id293656711/reviews.md

## What is Perfect OB Wheel?

Simple, fast, yet more thorough than any other pregnancy wheel available for the iPhone, Perfect OB Wheel is better than just a replacement for your trusty paper wheel.

Here's why Perfect OB Wheel is your best choice of gestational calculator:

 1) Input flexibility: Start with one of:
    • Last menstrual period (LMP)
    • Conception date
    • Estimated date of confinement/delivery (EDC)
    • Ultrasound dating: Number of weeks and days gestation as of a given date ("X Weeks").

 2) Input speed: Other wheels for the iPhone make you conform to them for entering your patient's information. Why not be able to choose based on how you are holding the phone and what else you are doing at the same time?
    • Use the numeric entry pad (0 3 3 0 2 0 0 8) and immediately see the results, OR
    • Spin the date wheel at the bottom of the screen and tap Next.

 3) Thorough results: All the information you would expect from a classic wheel, plus more:
   • Estimated Due Date
   • LMP Date
   • Conception Date
   • 1st Trimester End Date
   • 2nd Trimester End Date
   • Gestational Age
   • Conceptional Age
   • Expected Fetal Length based on standard fetal growth curves
   • Expected Fetal Weight based on standard fetal growth curves ("How much does my baby weigh, doctor?")

Results are relative to 'today' by default; this can be quickly changed to reflect any date by tapping the 'today' button and selecting a new date.

 4) Accurate results: Perfect OB Wheel provides exact dates and accounts for all calendar variance, including leap years. 

 5) Persistence: Perfect OB Wheel remembers the date and date type you last used and restores them when launched to streamline your workflow.

 6) Perfect OB Tracker upgrade: Available as an in-app purchase update, the Perfect OB Tracker lets you track any number of pregnancies, with at-a-glance due date and gestational age and one-tap access to all the data Perfect OB Wheel provides.  A  picture and text notes can be kept on each patient. Postpartum tracking is also available. Passcode locking is available for HIPAA compliance.

## Key features

- Flexible input (LMP, conception, EDC, ultrasound)
- Fast data entry options
- Detailed pregnancy results
- Accurate date calculations
- Persistence of last used data
- Optional pregnancy tracking upgrade

## Pricing and in-app purchases

Base price: $1.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Perfect OB Tracker | $4.99 | one-time |


## Chart rankings

- #150 in Top Paid · Medical (US App Store)

## What do users think of Perfect OB Wheel?

Overall sentiment: positive

**Pros**

- 🚀 Extremely helpful
- 🚀 Couldn't do my job without it
- 🚀 Perfect wheel is well-named
- 🚀 I love this app!
- 🚀 Great app!!
- 🚀 Easily the fastest way and most flexible app
- 🚀 Use all the time
- 🚀 Could not work without it
- 🚀 Very Helpful
- 🚀 I use this app at work every day
- 🚀 Love this app! As a L&D RN for many years, this app gives me a quick and accurate info!
- 🚀 On wheel
- 🚀 Help!
- 🚀 The best tool
- 🚀 Showed to my OB who loved it
- 🚀 Use it all the time!
- 🚀 Love it!
- 🚀 Great app
- 🚀 Perfect for tool for the OB setting
- 🚀 Best OB wheel app
- 🚀 Great app
- 🚀 Same app my OB uses!
- 🚀 Excellent app. Extremely helpful in keeping a small private practice organized!
- 🚀 Great app.
- 🚀 Class A
- 🚀 OB Wheel
- 🚀 Great for OB in med school or residency
- 🚀 Great app!
- 🚀 Very helpful and easy to use
- 🚀 Nice tool
- 🚀 Great App
- 🚀 Brilliant!
- 🚀 Very accurate!
- 🚀 Good app
- 🚀 Perfect wheel
- 🚀 Best wheel
- 🚀 Love it!!!!
- 🚀 Paed doc
- 🚀 Perfect
- 🚀 Very specific, but excellent use.
- 🚀 Perfectly implemented
- 🚀 Another outstanding application from Evan

**Cons**

- 🐛 rip off to force you to pay more
- 🐛 App stopped opening
- 🐛 Stopped working after update 45
- 🐛 Crashing!!
- 🐛 Latest update
- 🐛 Why!!!
- 🐛 App crashes after update
- 🐛 What wheel
- 🐛 Crashing!!
- 🐛 Latest update
- 🐛 Stopped working after update
- 🐛 Dates
- 🐛 Was great until the update

**Commonly reported bugs**

- App crashes after update
- Delivered today button not working after upgrade
- Dates keep changing when entering info

**Most requested features**

- Date-adjustment for women who have a five week menstrual cycle
- More fields for infant info, apgars and weight
- Ability to adjust cycle length
- Ability to type in a gestation and get a date or type in a date and get a gestation
- Calculate GA on a specific date

## Recent user reviews (10 of 200)

All indexed reviews: https://appshunter.io/ios/app/perfect-ob-wheel/id293656711/reviews.md

### 5/5 — Ótimo

*2026-05-15*

Ótimo

### 5/5 — Great app!

*2026-03-10, version 58*

I love this app. It’s easy to use.

### 4/5 — Love ite

*2026-01-16, version 58*

I love this app. But can you update the notes so that I can insert pictures? Thank you!

### 5/5 — Extremely helpful

*2024-08-23, version 58*

I am a nurse in a prenatal clinic and use this multiple times a day. So convenient having everything in one place whether you start with last menstrual period, estimated due date or gestational age, It all works quickly and flawlessly.

### 5/5 — Le faltan detalles

*2023-05-18, version 58*

Es una aplicación simple y práctica pero le hacen falta algunos detalles para alcanzar la 5 estrella

### 1/5 — Duas cobranças

*2023-03-14*

O App para registro é necessário realizar um upgrade de R$27,90. Se a 1ª versão fosse gratuita ok, o problema que o que você paga por 10,00 é apenas para ver a data não pode deixar nada salvo. Para que serve então?

### 5/5 — OB doctor

*2022-11-08, version 58*

Couldn’t do my job without this app.

### 5/5 — Utilissima

*2022-09-16, version 58*

Molto versatile e semplice da utilizzare

### 4/5 — Ottima applicazione

*2022-03-01, version 58*

Molto utile e carina anche l’idea della foto, ma sarebbe utile uno spazio più ampio per le note per scrivere qualche notizia anamnestica fondamentale

### 5/5 — Review

*2021-12-29, version 58*

Perfect wheel is well-named. Dr. Dave

## Frequently asked questions about Perfect OB Wheel

### What does the Perfect OB Wheel app do?

The Perfect OB Wheel app is a thorough obstetrics calculator designed to provide detailed pregnancy information. It helps users determine estimated due dates, gestational ages, and other key pregnancy milestones based on various input methods.

### What are the key features of this pregnancy calculator?

Key features include flexible input options such as last menstrual period (LMP), conception date, EDC, and ultrasound dating. It offers fast data entry, accurate results accounting for leap years, and displays comprehensive information like estimated due date, trimester end dates, and expected fetal growth.

### Is the Perfect OB Wheel app free to use?

The core functionality of the Perfect OB Wheel app is available for free. However, an optional 'Perfect OB Tracker' upgrade is offered as an in-app purchase, which provides additional features for tracking multiple pregnancies and postpartum details.

### What information can I get from the app?

The app provides a wide range of information including the Estimated Due Date (EDC), LMP Date, Conception Date, 1st and 2nd Trimester End Dates, Gestational Age, Conceptional Age, and Expected Fetal Length and Weight based on standard growth curves.

### Who is this app intended for?

This app is intended for healthcare professionals, such as obstetricians and midwives, as well as expectant parents who want a reliable and detailed tool for calculating and tracking pregnancy-related dates and information.

## Version history (last 5 releases)

### 59.1 — 2026-08-11

• Fixed a crash at launch on iPads running iOS 26.
• New in Settings: Back Up All Data — export a complete copy of your patient database and photos.
• The app now keeps automatic local snapshots of your database for extra data safety.

### 58 — 2021-10-16

• Enhanced iCloud sync! Synchronization is now both more reliable and faster.
• Corrected a bug that could create duplicate entires.
• Fixed delivery date calculations in time zones near the international date line such as Australia and New Zealand.
•Various other fixes

### 57 — 2021-10-16

Disabled iCloud Sync in this version as it was not working well; we will re-enable it once it is updated for iOS 15 and working reliably.

### 56 — 2021-09-29

Disabled iCloud Sync in this version as it was not working well; we will re-enable it once it is updated for iOS 15 and working reliably.

### 54 — 2021-09-20

• We now support all iOS devices and screen sizes
• Dark mode support with additional fixes in this version
• Text size accessibility support
• Miscellaneous improvements

## Apps similar to Perfect OB Wheel

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Guide to Clinical Midwifery](https://appshunter.io/ios/app/guide-to-clinical-midwifery/id1462064341) | 4.6 (87) | Free | Medical |
| [MD on Call](https://appshunter.io/ios/app/md-on-call/id333195169) | 5.0 (1) | $9.99 | Medical |
| [ASCCP Management Guidelines](https://appshunter.io/ios/app/asccp-management-guidelines/id1498550832) | 4.8 (8,595) | $14.99 | Medical |
| [Well Woman Visit App by NPWH](https://appshunter.io/ios/app/well-woman-visit-app-by-npwh/id871158138) | 5.0 (4) | Free | Medical |
| [OB Wheel for Pregnancy](https://appshunter.io/ios/app/ob-wheel-for-pregnancy/id6451180396) | 4.7 (39) | Free | Medical |
| [ACOG](https://appshunter.io/ios/app/acog/id616323665) | 4.9 (6,292) | Free | Medical |

## More apps by Evan Schoenberg

- [MediMath Medical Calculator](https://appshunter.io/ios/app/medimath-medical-calculator/id289039914)
- [ATP3 Lipids Cholesterol Management](https://appshunter.io/ios/app/atp3-lipids-cholesterol-management/id299487991)
- [Rowmote](https://appshunter.io/ios/app/rowmote/id300265786)
- [Optics Clinical Calculator](https://appshunter.io/ios/app/optics-clinical-calculator/id301059660)
- [MedAbbreviations](https://appshunter.io/ios/app/medabbreviations/id303058840)

All apps by Evan Schoenberg: https://appshunter.io/developer/289039917

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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 2026-08-31.*