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OB Wheel (Pregnancy calculator) for Android

By Quartertone Free

Developer's Description

The OB Wheel app is newly available as a Progressive Web App.


This Google Play Store version will be depreciated soon.


Multi-function pregnancy calculator.

Calculate dates of pregnancy:

-Last menstrual period (LMP)

-Estimated date of conception

-Weeks gestational age (WGA)

-WGA obtained by ultrasound

-Dating by IVF Embryo transfer

-Calculate gestation by Crown-Rump length

-Estimated due date (EDC)

-"Time Machine" mode can calculate "How many weeks will patient be on xxxx date?" and "When will patient be xx weeks gestation?"

Features still present, but no longer supported:

-Store multiple patients for easy retrieval

-Adjust length of cycle and luteal phase

-Full Help pages available

-Include extra notes in patient data

Please note: This app may be used for personal tracking purposes, but it is primarily meant to be a clinical tool for professional healthcare workers.




This app calculates exactly 280 days (40 weeks) from LMP to EDC, and accordingly for any date in between. Please note that the paper/plastic wheels used by obstetricians or ultrasound technicians are inherently inaccurate. Different pregnancy wheels may vary by as much as 3 or 4 days. Please keep this in mind when comparing the values obtained here to those given in clinics/hospitals.

Key words: pregnancy calculator, obstetrics, obgyn, obwheel, ob wheel

Full Specifications

What's new in version 9.1 (2016-07-03)

Update v9.1 (2016-07-03)

- NEW! - added Crown-rump length calculator (for reference only; does not calculate dates).

- PRO app will be phased out eventually and made into a purchase key.

- Patient saver will remain in app, but will not be supported (for now)


Release November 13, 2018
Date Added November 13, 2018
Version 9.1 (2016-07-03)

Operating Systems

Operating Systems Android
Additional Requirements None


Total Downloads 1,022
Downloads Last Week 0
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