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Pregnancy Calculator
Estimate your due date, current pregnancy week, and key trimester milestones based on your last menstrual period.
Estimated Due Date
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Current Week
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Trimester Milestones
How the Due Date Is Calculated
Due Date = LMP + 280 days (40 weeks)
Adjusted for cycle length: ± (cycle − 28) days
Adjusted for cycle length: ± (cycle − 28) days
Naegele's rule adds 280 days (40 weeks) to the first day of the last menstrual period. Only a healthcare provider can confirm your due date.
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