Pregnancy Due Date Calculator
Last Menstrual Period
How It Works
- LMP: Uses Naegele's Rule (LMP + 280 days). Cycle length adjusts ovulation.
- Conception: Due date = conception + 266 days.
- Ultrasound: Derives LMP from ultrasound date and GA, then calculates EDD.
- IVF: Adjusts embryo age to conception equivalent, then calculates EDD.