Pregnancy Due Date Calculator
Estimate a due date from the first day of the last menstrual period, using Naegele's rule (LMP + 280 days).
For informational purposes only — not medical advice. Always confirm with a qualified healthcare professional.
How it works
- 1
Enter the first day of the last period
The most recent one before conception.
- 2
Get an estimated due date
Based on a standard 280-day pregnancy.