Pregnancy Due Date Calculator
Estimate an expected due date from the first day of the last menstrual period (LMP). Also shows the current pregnancy week, trimester, and estimated conception date.
Estimates use Naegele's rule (LMP + 280 days). They are not a substitute for medical advice.
Enter the LMP date
Pick the first day of the last menstrual period to estimate the due date.
Frequently asked questions
How is the due date calculated?
We use Naegele's rule: due date = first day of last menstrual period + 280 days (40 weeks).
Is this a substitute for medical advice?
No. This calculator is informational. Always discuss your pregnancy timeline with a qualified healthcare provider.
What is the estimated conception date?
We estimate conception as 14 days after the LMP, assuming a regular 28-day cycle with mid-cycle ovulation. Actual conception varies.
What if my cycle is not 28 days?
The estimate can be off by several days. A healthcare provider can refine it with ultrasound or cycle data.