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Free Pregnancy Due Date Calculator — EDD from LMP

Calculate your estimated due date (EDD) from your last menstrual period using Naegele's Rule. See weeks remaining, days left, and your 3 trimesters at a glance.

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🤰Pregnancy Due Date Calculator — Live Tool

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How Due Date is Calculated

The standard method for calculating estimated due date (EDD) is Naegele's Rule, developed by German obstetrician Franz Naegele in 1812. It adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a regular 28-day cycle with ovulation on day 14.

Naegele's RuleEDD = LMP + 280 days (40 weeks)

Example: LMP = 1 January 2025
EDD = 8 October 2025

Pregnancy Trimesters

TrimesterWeeksKey Milestones
First1–12 weeksOrgan formation, morning sickness, first heartbeat
Second13–26 weeksBaby moves, anatomy scan, gender reveal
Third27–40 weeksRapid growth, birth preparation, maternity leave

⚠️ This calculator provides an estimate only. Actual due date may differ based on cycle length, conception date and ultrasound dating. Always consult your obstetrician for accurate pregnancy dating.

Important Pregnancy Dates

  • 8 weeks: First antenatal visit recommended
  • 11–13 weeks: First trimester screening (NT scan + blood test)
  • 18–20 weeks: Anomaly (anatomy) scan
  • 24–28 weeks: Gestational diabetes screening
  • 36 weeks: Weekly check-ups begin
  • 40 weeks: Estimated due date

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