How is my due date calculated?

Most due dates are estimated as 280 days (40 weeks) from the first day of your last menstrual period (LMP). If conception date is known, 266 days (38 weeks) from conception is used.

How accurate is the due date?

Due dates are estimates — only about 5% of babies are born on the exact due date. Ultrasound dating in early pregnancy is more accurate.

Can this tool replace medical advice?

No — this tool provides estimates and general guidance. For medical care and personalized information, consult your healthcare provider.

Pregnancy Due Date Calculator

Calculate expected due date from Last Menstrual Period (LMP) or estimated conception date. See current gestational age, time until delivery, and milestone dates.

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Last Menstrual Period (LMP)

Average cycle length (days) — used to adjust calculation

Or use Conception Date (optional)

Quick note: If you have an early ultrasound, its dating is more accurate than LMP. This calculator provides estimates only.

Pregnancy Due Date — FAQ & Guidance

Due dates are estimates for planning; most babies are born between 37 and 42 weeks. Keep regular prenatal visits for monitoring.

FAQ

What if my cycles are irregular?

If cycles are irregular, LMP-based estimates are less accurate — ultrasound dating is recommended.

What is gestational age?

Gestational age counts from the first day of LMP; gestational age at birth is commonly reported in completed weeks and days.