Pregnancy Due Date Calculator
Calculate your estimated due date, pregnancy week, conception date, trimester, and days remaining based on your last menstrual period.
Pregnancy Details
Enter the first day of your last menstrual period.
Enter the first day of your last period.
How is the due date estimated?
The calculator estimates the due date as approximately 280 days, or 40 weeks, from the first day of the last menstrual period.
Pregnancy Result
Your result will appear here
Enter your last menstrual period and click Calculate.
What is a Pregnancy Due Date Calculator?
A pregnancy due date calculator provides an estimated date when a baby may be born. The estimate is commonly calculated using the first day of the last menstrual period.
How is the due date calculated?
A typical pregnancy is estimated to last around 40 weeks, or 280 days, from the first day of the last menstrual period. The calculator adds this period to estimate the expected due date.
Estimated Due Date
LMP + 280 days
Pregnancy Trimesters
First Trimester
Approximately weeks 1–13.
Second Trimester
Approximately weeks 14–27.
Third Trimester
Approximately week 28 onward.
Important Information
This calculator provides an estimate for informational purposes only. Pregnancy length can vary, and an estimated due date does not guarantee the actual delivery date. Consult a qualified healthcare professional for personalized medical advice.