Partus: Pregnancy Wheel

The OB wheel that finally grew up — ACOG ultrasound redating, IVF transfer dating and the Bishop score, on one clean screen built for healthcare professionals.

 Download on the App Store

Free to download · wheel & weeks included · one-time unlock for ACOG redating, IVF & Bishop · no account · works offline

What is Partus?

Partus is an iPhone and iPad pregnancy wheel (OB wheel) for healthcare professionals. It calculates gestational age and the due date from the LMP, conception date, ultrasound or IVF transfer, applies the ACOG Committee Opinion 700 ultrasound redating thresholds, and computes the Bishop score. It is free to download with a one-time unlock for the advanced tools, needs no account, collects no data and works offline.

Free clinical calculators

The core dating rules from the app, free in your browser — no download, no sign-up.

Pregnancy Wheel Calculator (OB Wheel) → LMP, due date or conception → every other date, gestational age today and milestone dates. EDD = LMP + 280 days. ACOG Ultrasound Redating Calculator → LMP vs ultrasound gestational age → redate or keep, using the ACOG CO 700 thresholds (5 / 7 / 10 / 14 / 21 days). IVF Due Date Calculator → Embryo transfer date → due date for day-3 (+263), day-5 (+261) and day-6 (+260) transfers, fresh or frozen. Bishop Score Calculator → Dilation, effacement, station, consistency and position → score 0–13 and cervical favorability for induction.

A pregnancy wheel built for clinicians — not another baby tracker

Ultrasound redating, per ACOG

Enter the exam date and measured GA — Partus applies the ACOG Committee Opinion 700 thresholds and tells you plainly which dating applies, on the same screen as the wheel.

IVF transfer dating

Day-3, day-5 or day-6 transfer → EDD in two taps, no LMP needed. The wheel keeps a visible note that dates came from IVF.

Bishop score, live

Five parameters, instant score and interpretation — requested by clinicians for years, delivered here.

Gestational age & due date calculator, both directions

Edit LMP, EDD, conception or today's GA — everything else recalculates instantly. Plus a reverse calculator: "the patient was 12 w 0 d on…".

Free download. No subscription. No data.

The wheel and the week calculator are free. ACOG redating, IVF dating and the Bishop score are a single one-time unlock. No account, no sign-in, fully offline, App Store privacy label: Data Not Collected. Sources cited in-app (ACOG CO 700; Bishop 1964; Hadlock 1991).

Support

Questions, bug reports or feature requests are welcome at ep@tommano.com. We usually reply within a few days.

Privacy Policy

Partus collects no data. The app has no account, no sign-in, no analytics, no advertising and no third-party code. It never connects to the internet: every calculation happens on your device, and the only stored value (the last entered date) stays in your device's local storage. Nothing is ever transmitted to us or to anyone else.

Because no data is collected, there is nothing for us to share, sell, or delete. If you have any questions about this policy, contact ep@tommano.com.

Effective date: July 29, 2026.

Disclaimer

Partus is a reference calculator for healthcare professionals. It does not provide medical advice or diagnosis. Calculation rules follow ACOG Committee Opinion No. 700 (2017, reaffirmed 2025) and Bishop (1964); each calculator page lists its formulas.

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