Pregnancy Due Date Calculator
Estimate your pregnancy due date, conception date and how many weeks pregnant you are from the first day of your last menstrual period.
Enter your values and press Calculate.
How to use the Pregnancy Due Date calculator
Only about 4% of babies arrive on their exact due date; most arrive within two weeks either side. An early ultrasound gives a more accurate date. Always follow the advice of your midwife or doctor.
Formula
Naegele’s rule: Due date = first day of last period + 280 days, adjusted by the difference between your cycle length and 28 days.
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