Pregnancy Due Date Calculator
Estimate your due date from your last menstrual period (LMP). See current week, trimester, and key milestones.
Input
Default 28 days. Adjust if your cycle is longer or shorter — it shifts the due date accordingly.
Estimated Due Date
—
Estimated Due Date (EDD)
💡 Naegele's Rule
How it works
- Due date = LMP + 280 days (40 weeks).
- Adjusted for cycle length: if cycle is 30 days instead of 28, add 2 extra days.
- Only ~5% of babies arrive exactly on the due date; most come within ±2 weeks.
📅 Trimesters
Pregnancy Timeline
- 1st Trimester: Weeks 1–12
- 2nd Trimester: Weeks 13–26
- 3rd Trimester: Weeks 27–40
- Full term: 39–40 weeks