Comprehensive Guide to Pregnancy Calculator
Calculate your estimated due date, current week of pregnancy, and trimester with our free Pregnancy Calculator. Simply enter the first day of your last menstrual period.
Understanding Pregnancy Timing
Pregnancy is divided into three trimesters: First (weeks 1-12), Second (weeks 13-27), and Third (weeks 28-40). Your due date is an estimate — only about 5% of babies are born exactly on their due date.
Important Milestones
Key milestones include the first heartbeat (week 6), first ultrasound (weeks 8-12), anatomy scan (week 20), viability (week 24), and full term (weeks 39-40).
Due Date Calculation (Naegele's Rule)
The standard pregnancy lasts approximately 280 days (40 weeks) from the first day of the last menstrual period (LMP). Adjustments are made for cycle lengths that differ from the average of 28 days.
Numerical Example Calculation
Example Calculation: Inputting standard baseline metrics generates real-time results instantly.