Pregnancy Due Date Calculator
Estimate your due date using Naegele's rule (LMP + 280 days) and track gestational age.
Informational estimate only. Not medical advice. Consult your physician, midwife, or OB-GYN for pregnancy care decisions.
Frequently Asked Questions
What is Naegele's rule?
A clinical estimate: due date = first day of last menstrual period (LMP) + 280 days (40 weeks). Assumes a regular 28-day cycle with ovulation on day 14.
How accurate is this?
Only about 4-5% of babies are born on their estimated due date. Most deliveries fall within ±2 weeks. Ultrasound dating in the first trimester is more accurate.
Is this medical advice?
No. This tool is for informational purposes only. Always consult your physician, midwife, or OB-GYN for pregnancy care decisions.