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Pregnancy Due Date Calculator
Find your estimated due date.
Enter the first day of your last menstrual period to get your due date and trimester dates.
Please note: This calculator gives a general estimate for information only. Cycles and pregnancies vary from person to person, so real dates can be different. It is not medical advice. Please see a doctor or midwife for advice about your own situation.
How this calculator works
This calculator uses Naegele's rule, the standard method doctors use to estimate a due date: add 280 days (40 weeks) to the first day of your last menstrual period. If your average cycle is longer or shorter than 28 days, the estimate is adjusted accordingly.