Spin the wheel, read the date. OB Wheel is the interactive pregnancy wheel and five-method due-date calculator that gives you an EDD and a live gestational age in seconds — the paper wheel on your desk, rebuilt for your phone.
Most due-date apps only ask for a last period. OB Wheel dates a pregnancy five different ways and cross-checks them the way a clinician actually works: from LMP (Naegele's rule, cycle-length adjusted), from a conception date, from an ultrasound measurement, backward from a known due date, or from a reported gestational age on a reference date. Every method instantly shows gestational age today, trimester, and conception date, and the interactive wheel lets you scrub any calendar date to any gestational week.
WHAT YOU GET
- Five dating methods (LMP, conception, ultrasound, known due date, reported GA) that agree on one gestational age
- An interactive 40-week obstetric wheel you drag to read GA at any date, and the date at any GA
- Gestational age in weeks and days, with trimester and conception date, updated automatically every day
- A week-by-week fetal development guide from week 4 to week 40, bundled on-device
- Cycle-length adjustment so a longer or shorter cycle shifts the estimate correctly
- Due-date reminders and one-tap plain-text summaries you can share or paste into a chart
PERFECT FOR
- OB/GYNs, midwives, and L&D nurses who need a fast, reliable dating wheel at the bedside
- Expecting parents who want a clear due date and week-by-week progress
- Anyone tracking a pregnancy from an ultrasound or conception date, not just LMP
- Medical and nursing students learning gestational-age math
WHY NOT JUST USE A PAPER WHEEL?
A paper wheel dates one way, can't adjust for cycle length, and wears out. OB Wheel reconciles five methods, recalculates instantly, keeps every profile in one place, and fits in your pocket.
PRIVACY
Everything is calculated and stored on your device. No account, no sign-up, no tracking, and no network connection — your pregnancy data never leaves your phone.
FULL ACCESS
The calculators, the interactive wheel, and the weekly guide are free, and you can save one pregnancy. OB Wheel Pro unlocks unlimited saved patients and pregnancies plus clinical summary export. Pro is available as a weekly plan, a yearly plan, or a one-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends; manage or cancel anytime in your App Store settings.
OB Wheel gives educational estimates only. It is not a medical device and does not provide a diagnosis. Always confirm dates with your doctor or midwife.
Add your first pregnancy and spin the wheel today.
Terms of Use (EULA): https://web-levi.web.app/terms
Privacy Policy: https://web-levi.web.app/privacy-policy
Questions? tphuc.work@gmail.com
