Philadelphia Pregnancy Due Date Calculator
Quickly estimate your due date and track key milestones in the Philadelphia area.
Calculate Your Dates
About This OBGYN Pregnancy Calculator
Gestation typically lasts about 40 weeks from first day of last menstrual period. Estimating arrival of a newborn gives an approximate timeframe for delivery, which may vary depending on cycle length and ovulation timing. Standard approach adds 280 days, or 40 weeks, to first day of last period.
For someone whose last menstrual period started January 1, estimated arrival would be around October 8. This assumes an average 28-day cycle with ovulation near day 14. Shorter cycles may move timing slightly earlier, while longer cycles may push it later.
For last menstrual period beginning February 15, expected arrival usually falls on November 21. March 10 would suggest December 16. April 5 would point to January 10 of next year. Each estimate is approximate since conception may not happen exactly on ovulation day.
Early ultrasound scans can refine estimates by measuring fetal size against gestational age. If differences appear, adjustments may be made. This is particularly useful for those with irregular cycles or uncertain dates.
Tracking weeks and months of development allows preparation for appointments, planning time off work, and anticipating milestones. Week-by-week progress highlights growth and changes over time for both mother and child.