OB Wheel: Pregnancy calculator

3.12K reviews
Content rating
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About this app

Join the Beta testing group


Multi-function pregnancy calculator. Created by a board-certified ObGyn.

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
-Include extra notes in patient data

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.
(see here: https://bit.ly/pregwheel)


OBWheel is now completely FREE!

If you would like to continue supporting me directly, you can do so at https://buymeabeer.com/quartertone

You can also donate directly to organizations that need your help right now:

lebanoncrisis.carrd.co - Lebanon Crisis support organizations
supportlrc.app/donate - Lebanese Red Cross
wck.org - World Central Kitchen
ri.org - Relief International
msf.org - Doctors Without Borders
reproductiverights.org - Center for Reproductive Rights
thetrevorproject.org - Trevor Project
blacklivesmatter.com - Black Lives Matter
plannedparenthood.org - Planned Parenthood
eji.org - Equal Justice Initiative
hrc.org - Human Rights Campaign

The people of the world thank you for your support.
We are one.
Updated on
Aug 31, 2020

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
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3.12K reviews
A Google user
September 18, 2019
Up until now the app has been great. The new web based one doesn't give me the option to store client details - due dates etc. I like the original app where I could easily track my pregnant clients. - added a star as the new update has helped. Waiting for web app to be further updated.
58 people found this review helpful
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Beulah Jera
July 24, 2020
"This feature is not available try the web app". The worst app ever. Don't waste your data downloading this. There are better apps out there than this... It needs to be updated and fixed. C'comn now!!!
55 people found this review helpful
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Messiás Áron Kor
March 8, 2022
I would like to have time travel to make the time and the gestatinal age so i can calculate more esaly the termen other than that it my day to day app. Thank u very much for making it
22 people found this review helpful
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What's new

OBWheel is now completely FREE!