Pregnancy Due Date Calculator
Estimated Due Date
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Current Week
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Current Trimester
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Days Remaining
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Conception Date (est.)
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2nd Trimester Starts
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3rd Trimester Starts
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How Due Date is Calculated
From LMP: Add 280 days (40 weeks) to the first day of your last menstrual period (Naegele's rule). From conception: Add 266 days (38 weeks). Only about 5% of babies are born on their exact due date.
Trimesters: 1st: Weeks 1-12, 2nd: Weeks 13-26, 3rd: Weeks 27-40.