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Pregnancy Due Date Calculator

Estimate your baby's arrival date with confidence

📅 Calculate Your Due Date

First Day of Last Period (LMP)

💡 How Due Dates Are Calculated

A typical pregnancy lasts about 40 weeks (280 days) from the first day of your last menstrual period (LMP). This is known as Naegele's Rule. If calculating from conception, the due date is approximately 38 weeks (266 days) after conception. Only about 4% of babies are born exactly on their due date — most arrive within two weeks before or after.