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App Store Apps > Medical > The OB Wheel Pro 7
The OB Wheel Pro 7 icon

The OB Wheel Pro 7

by Don Miller · Medical · $1.99
On the App Store since October 2013 · Data updated 2026-10-18
App Store

The OB Wheel Pro 7 is made and published by Don Miller. AppBrain is an independent app data site and isn't affiliated with Don Miller. The app name, icon, screenshots and description belong to Don Miller and are shown as published on the App Store.

AppBrain's verdict

Established
Best rank
#27
Top Paid, Germany
Rating on App Store
4.00
5 ratings
Last updated
March 30, 2019

It doesn't have enough ratings yet to judge what users think. Its best ranking is #27 in Top Paid, Medical in Germany.

Rankings

App Store top charts
Highest rank
#27
Chart
Top Paid
Medical
Country
Germany

App Store Rankings for The OB Wheel Pro 7

Top rankings

Rank Country Category List
27 Germany Medical Top Paid
43 Poland Medical Top Paid
54 Mexico Medical Top Paid
55 Indonesia Medical Top Paid
56 Spain Medical Top Paid
58 Brazil Medical Top Paid
82 Italy Medical Top Paid
93 India Medical Top Paid

Ranking history in Germany

Competitors

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Releases

Updates seen on the App Store
Version
2.1
Launched
October 2013

No changelog data

User feedback

Ratings and reviews on the App Store

Comments on The OB Wheel Pro 7 for iOS

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Technology

Found in the app by AppBrain
Price
$1.99
App size
1.47 MB
Content rating
Everyone

Technologies used by The OB Wheel Pro 7

About the app and developer

About The OB Wheel Pro 7

The OB Wheel Pro 7 is a medical app developed by Don Miller.

User Ratings

The OB Wheel Pro 7 is rated 4.00 out of 5 stars. The rating is based on 5 ratings.

App Information

The OB Wheel Pro 7 costs $1.99. The app size is 1.47 MB. The latest version available is 2.1. The last update was on March 30, 2019.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since October 2013.

Developer information for Don Miller

Don Miller

Address:

Share The OB Wheel Pro 7

Store listing

By Don Miller, from the App Store
The OB Wheel Pro 7 Screenshot 1 of 6
The OB Wheel Pro 7 Screenshot 2 of 6
The OB Wheel Pro 7 Screenshot 3 of 6
The OB Wheel Pro 7 Screenshot 4 of 6
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The OB Wheel Pro 7 Screenshot 6 of 6
Screenshots by Don Miller, from the the App Store listing
Description by Don Miller Written by the developer, not by AppBrain. Click to read.
The OB Wheel Pro 7 is the most complete, powerful, and easiest-to-use tool for healthcare professionals providing prenatal care. In just ONE app there is 1) a gestational age calculator, 2) an ultrasound biometric calculator, 3) a fetal weight calculator, 4) a list of key weeks and trimesters, 5) an age-adjusted risk table for trisomy 21 and aneuploidy, 6) a BMI calculator, and NOW 7) an Apple Watch app is included with your purchase!

The OB Wheel Pro 7 is a state-of-the-art gestational age calculator (also known as an obstetric or pregnancy wheel) that is used every day by doctors, obstetricians, midwives, nurses, and pregnant women. The OB Wheel Pro 7 is a professional tool that replaces the need for multiple apps and it greatly enhances the functionality of those worn-out cardboard wheels without compromise.

The OB Wheel Pro 7 accurately determines the estimated delivery date (EDD), or due date, of a pregnancy based on the first day of a woman's last menstrual period (LMP), or from the date of conception, or from a known gestational age (GA) on a known date, e.g. from an ultrasound measurement, or from fetal biometry like Crown-Rump Length (CRL), Femur Length (FL), and BiParietal Diameter (BPD). Additionally, for appropriate gestational ages, The The OB Wheel Pro 7 estimates fetal weight and displays the number of days completed and remaining.

The OB Wheel Pro 7, besides calculating GA from fetal ultrasound biometrics, enables clinicians to also calculate Estimated Fetal Weight (EFW) from FL, BPD, Head Circumference (HC), and Abdominal Circumference (AC) using the most appropriate published reference formula using the maximum and most appropriate parameters.

Prenatal care providers know that there are key gestational ages where testing or interventions are needed. The OB Wheel Pro 7 lets providers see at a glance when these items should be scheduled.

FEATURES
• Includes Apple Watch app!
• Gestational Age Calculator from LMP, EDD, Conception Date for any reference date
• Gestational Age calculated from specific date and gestational age (e.g. ultrasound)
• Gestational Age Calculator using fetal biometrics (CRL, FL, BPD)
• Fetal Weight Calculator using HC, AC, FL, BPD
• Body Mass Index (BMI) Calculator
• Age-Adjusted Risk Table for Trisomy 21 and aneuploidy
• List of key completed weeks during pregnancy
• Pregnancy days completed and remaining, and dates for each trimester
• Remembers last-used EDD


PRO TIPS:
• To enter Gestational Age, CRL, FL, or BPD for a specific date (like for an ultrasound exam), tap "Today", enter the desired date, then tap on the button displaying the gestational age to change that button to display options for entering a specific GA, CRL, FL, and BPD.
• When using the GA calculator, double-tap a date to change the value to the current date.
• When using the EFW calculator, double-tap a value to clear the value of the selected parameter.
Official page on the App Store
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