Pregnancy Due Date Calculator: Complete Guide
A pregnancy due date calculator estimates the expected delivery date from the first day of your last menstrual period. It also provides a simple trimester timeline to help with early planning and discussion with your healthcare provider.
How to Use This Calculator
- Select the first day of your last menstrual period.
- Review the estimated due date shown by the calculator.
- Use the trimester milestones as an approximate timeline.
Calculation Formula
Estimated due date = First day of LMP + 280 days
If the first day of the last menstrual period is 1 January, the standard 40-week estimate is 8 October of the same year.
Frequently Asked Questions
Is the due date exact?
No. It is an estimate. A healthcare provider may adjust it using cycle history, examination, and ultrasound findings.
What if I do not know my LMP?
Speak with your healthcare provider. They can help estimate dates using other clinical information.
Related Calculators
This estimate is for general information only. Contact a qualified healthcare provider for pregnancy care.