The Pregnancy Calculator
OB Wheel brings the precision of clinical pregnancy dating tools to your iPhone, iPad, and Mac. Whether you’re an obstetrician, midwife, nurse, medical student, or expectant parent, OB Wheel provides accurate, evidence-based pregnancy calculations following ACOG Committee Opinion.
ACCURATE CALCULATIONS, MULTIPLE METHODS
Calculate due dates using any dating method:
• Last Menstrual Period (LMP)
• Conception/Ovulation Date
• Ultrasound Dating with ACOG-compliant redating thresholds
• IVF/ART with embryo transfer support (Day 3, 5, or 6)
• Known Due Date reverse calculation
COMPREHENSIVE PREGNANCY INFORMATION
Every calculation provides:
• Estimated Due Date with countdown
• Current Gestational Age in weeks and days
• Trimester milestones (13w, 27w, 39w)
• Expected fetal size and weight
• Full term date (39 weeks)
• Interactive OB Wheel visualization
PATIENT MANAGEMENT
Keep track of multiple pregnancies:
• Save patients with pregnancy records
• Add ultrasound measurements
• Monitor redating recommendations
• Store clinical notes
• Track pregnancy progression over time
BEAUTIFUL, PROFESSIONAL INTERFACE
• Clean, medical-grade design
• Dark mode support
• Haptic feedback for interactions
• Accessibility features throughout
• Customizable display preferences
PRIVACY FIRST
• All calculations performed on-device
• Patient data stored securely in your private iCloud
• No third-party tracking
• HIPAA-minded design principles
• You own your data
PERFECT FOR:
Healthcare Professionals:
• Obstetricians and gynecologists
• Midwives and nurse practitioners
• Family medicine physicians
• OB/GYN residents and medical students
• Labor & delivery nurses
Expectant Parents:
• Track your pregnancy week by week
• Understand your ultrasound dates
• Know when you’ll reach each trimester
• Share milestones with family
FEATURES AT A GLANCE
Multiple dating methods (LMP, conception, ultrasound, IVF)
Patient and pregnancy tracking
Ultrasound measurement database
Interactive pregnancy wheel
Fetal growth estimates
Clinical reference materials
iCloud sync across devices
Share calculations easily
Offline functionality
No subscription required
EVIDENCE-BASED ACCURACY
All calculations follow guidelines from:
• ACOG Committee Opinion
• Standardized first-trimester CRL dating
• Evidence-based ultrasound redating criteria
• Standard 280-day pregnancy calculation
MEDICAL DISCLAIMER
OB Wheel is intended for informational and educational purposes. It should not replace professional medical advice, diagnosis, or treatment. Always consult with qualified healthcare providers for pregnancy-related decisions.
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