Pregnancy Due Date Calculator
Estimate your baby's due date based on the first day of your last menstrual period.
Your result
Enter the first day of your last period and we'll estimate your due date and pregnancy timeline.
How it works
Based on the information entered, your estimated due date is calculated. Most pregnancies last around 40 weeks from the first day of the last menstrual period. However, only a small percentage of babies arrive exactly on their due date. The result should be viewed as an estimate rather than a guarantee.
Pregnancies vary naturally. Medical professionals may revise due dates following ultrasound scans, especially if the early dating scan suggests a different gestational age than calculated from the LMP alone.
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