Health Calculators

Pregnancy due date.

Estimate your due date, current week of pregnancy, and trimester milestones from the first day of your last period.

Last menstrual period

days
Uses Naegele's Rule (+280 days). Adjusted for cycles other than 28 days.

Estimated due date

Fill the form and press Calculate.

About this estimate

Pregnancy is counted from the first day of your last menstrual period (LMP), not from conception. Only about 5% of babies arrive exactly on their due date; 80% arrive within two weeks of it. Early ultrasound measurements are more accurate than LMP dating and your doctor may adjust the due date based on those findings.

Disclaimer

Educational estimate only. Always consult your healthcare provider for accurate pregnancy dating and prenatal care.