Pregnancy due date
Enter the first day of the last menstrual period. The page adds 280 days, which is 40 weeks, and also shows 14 days after that start as a rough conception date.
- Not medical advice
- Free, no sign-up
This is a standard formula, not medical advice.
Free to use, no account. More everyday tools
How to use it
- Enter the first day of the last period.
- Read the estimated due date.
- Treat it as a date, not a prediction of the birth.
What 280 days means
Naegele's rule, as used here, is the LMP date plus 280 days. Ultrasound dating and a cycle that is not 28 days will disagree with it. The conception line is simply 14 days after the date you typed.
The page does not store a pregnancy, send a reminder or interpret symptoms.
Private by design
Privacy
The date stays in this tab and is not uploaded. This is not medical advice.
Questions
Is the due date the day I will give birth?
No. It is 40 weeks from the date you entered. Births cluster around that day, not on it.
What if I know the conception date instead?
This page starts from the LMP date. Do not put a conception date in the box.
Does it adjust for a long cycle?
No. It always adds 280 days.