Pregnancy Due Date Calculator
Calculate your Expected Date of Delivery (EDD) using LMP, ultrasound, conception date, or IVF transfer date with medically accurate formulas.
Due Date Calculation
Select your preferred method and enter the required information
Typical range: 21-35 days
Due Date
Select a method and enter your information to calculate your due date.
Understanding Due Date Calculations
Method Accuracy
- IVF Transfer: Most accurate (±5 days)
- Early Ultrasound: Very accurate (±7 days)
- Conception Date: Good accuracy (±10 days)
- LMP Method: Standard method (±14 days)
Example Calculation
LMP: January 1, 2025 (28-day cycle)
Formula: LMP + 280 days
Due Date: October 8, 2025
Current (Feb 1): 4w 3d pregnant
Important Facts
- Only 4% of babies arrive on exact due date
- 37-42 weeks is considered full-term
- First babies often arrive 1-2 days late
- Cycle length affects LMP calculations
When to Use Each Method
- LMP: Regular cycles, known LMP date
- Ultrasound: Irregular cycles, uncertain LMP
- Conception: Known ovulation/conception date
- IVF: Assisted reproductive technology