OB Wheel & Due Date Calculator

OB Wheel & Due Date Calculator is a fast, offline pregnancy dating and reference tool built for doctors, nurses, midwives, and antenatal clinic staff.

DATING MODES
- LMP — enter the last menstrual period for instant EDD and gestational age
- Ultrasound Scan — dating by CRL or GA-at-scan
- IVF — dating from embryo transfer date
- On Date — GA on any target date, past or future
- Reverse — work backward from a known EDD to LMP

WHAT YOU GET INSTANTLY
- Estimated Due Date (EDD) and gestational age in weeks + days
- Trimester and a visual gestation progress bar
- Estimated conception date and days remaining to EDD
- Post-dates flag with induction-workup prompt

CLINICAL REFERENCE, BUILT IN
- Expected fetal biometry by week (Hadlock population means: CRL, BPD, HC, AC, FL, EFW)
- Week-by-week milestone and screening guide — NT scan, anomaly scan, GDM/DIPSI screening, Anti-D timing, GBS swab, and more
- Quantitative β-hCG dating guide
- Trimester-wise antenatal test schedule and precautions, aligned with FOGSI, ACOG, RCOG and WHO guidance
- Baseline antenatal lab panel checklist
- Warning-signs quick reference

SAVE & SHARE
- Save calculations with a patient name/ID for later reference
- Copy a clean summary to clipboard for notes or referrals
- Full calculation history, stored on your device

WORKS OFFLINE
No login, no internet required, no patient data leaves your device.

For qualified healthcare professionals only. This app is a clinical decision-support and reference tool — it does not replace professional medical judgment. Always confirm dating and growth against your ultrasound machine's validated curve and current clinical guidelines.