Pregnancy Conception Calculator
Estimate the conception date or last menstrual period (LMP) based on your due date or baby's birth date. Helpful for tracking when pregnancy occurred.
Conception from Due Date
LMP from Birth Date
Understanding Conception Dates
- Conception Timeline — Conception typically occurs 10-14 days after the first day of your last menstrual period
- Medical Dating — Pregnancy is dated from the first day of the LMP, not from conception
- Accuracy — These are estimates; ultrasounds provide more accurate dating
- Normal Range — Babies born between 37-42 weeks are considered full-term
- Consult Doctor — Always confirm dates with your healthcare provider
Fertile Window
The fertile window is the 5 days before ovulation and the day of ovulation itself. For a typical 28-day cycle, ovulation occurs about 14 days before your next period. Most pregnancies result from intercourse during the 2-3 days before ovulation.