Calculate due date, weeks pregnant, and trimester dates.
Estimated Due Date
Weeks Pregnant
Days Pregnant
Days Remaining
Current Trimester
Trimester Dates:
Enter the date of your last period or your due date to calculate pregnancy milestones.
This pregnancy calculator estimates your due date based on the first day of your last menstrual period (LMP) or conception date.
The standard method uses Naegele's Rule: add 280 days (40 weeks) to the first day of your last period. This assumes a 28-day cycle with ovulation on day 14.
Only about 5% of babies are born on their exact due date. Most babies are born between 38 and 42 weeks. This calculator provides an estimate - always consult your healthcare provider for accurate prenatal care and dating.