1
Enter Last Period
Input the first day of your last menstrual period.
Pregnancy Due Date Calculator
Calculate your estimated due date and trimester
Pro Tip
Only 4% of babies arrive exactly on their due date. Full-term is 37-42 weeks. Due dates are estimates, not deadlines.
How to Use the Pregnancy Due Date Calculator
2
Calculate Due Date
Get estimated delivery date using standard 280-day gestation.
3
Track Milestones
View pregnancy milestones and development stages.
Pregnancy Timeline Calculation
Pregnancy is calculated from first day of last menstrual period (LMP), not conception. Standard gestation is 280 days (40 weeks) from LMP.
Frequently Asked Questions
Due dates are estimates with ±2 week variance. Only 4% of babies arrive exactly on predicted date.
Last menstrual period is a known date. Conception date is usually uncertain, occurring ~2 weeks after LMP.