Health and Fitness
Due Date Calculator
Estimate pregnancy due date from the first day of the last period.
Result
--What does this calculator do?
Estimate pregnancy due date from the first day of the last period.
Formula
A common estimate adds 280 days, or 40 weeks, to the last menstrual period.
Example calculation
This is a planning estimate and not a medical diagnosis.
Common use cases
- Pregnancy planning
- Appointment discussion
- General education
Limitations and accuracy notes
This calculator is for quick planning and education. Results depend on your inputs and may not include every real-world rule, fee, tax, health factor, or local requirement.
Due Date Calculator FAQ
Is this calculator free?
Yes. It gives quick estimates directly in your browser.
Should I use this as professional advice?
No. Use it as a planning aid and confirm important decisions with a qualified professional.