Due Date Calculator
Estimate your due date and pregnancy week by LMP, ultrasound, conception, or IVF
Due Date Calculator
About Due Date Calculator
This calculator estimates your due date (EDD, Expected Delivery Date) using common medical conventions. You can calculate from LMP, ultrasound, conception date, or IVF transfer and view a week-by-week timeline.
Formulas
LMP Method: EDD = LMP + 280 days (40 weeks). Adjusted by cycle length if ≠28 days
Ultrasound Method: EDD = ultrasound date + (280 days − gestational age in days)
Conception Method: EDD = conception date + 266 days
IVF Method: EDD = transfer date + (266 days − embryo age in days)
Results are for reference only
No results yet
Please fill in the form and click Calculate to see results
How to Use
Select an estimation method (LMP, ultrasound, conception, or IVF) that matches your situation.
Enter the required dates and values for the chosen method, then review your entries.
Click Calculate to view your estimated due date, current gestation, and full pregnancy timeline.
Notes
Results are estimates for single pregnancy and may vary.
For multiple pregnancies (twins, etc.), due dates differ.
Full-term is typically 39–41 weeks; births between 37–42 weeks are common.
Key Features
Estimated Due Date
Results are estimates for single pregnancy and may vary.
Current Gestation
Full-term is typically 39–41 weeks; births between 37–42 weeks are common.
Heartbeat detectable by ultrasound
Ultrasound Method: EDD = ultrasound date + (280 days − gestational age in days)