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Due Date Calculator

Calculate your estimated due date from last menstrual period

Last Menstrual Period (LMP)
⚠️ This calculation is for reference only based on dates. Please visit a healthcare provider for an accurate due date confirmation via ultrasound.
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FAQ
How is the due date calculated?
Using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. Adjusted for cycle lengths other than 28 days.
What if my cycle is irregular?
This calculation may be less accurate with irregular cycles. An ultrasound is the most accurate way to determine your due date.
Will I deliver on the exact due date?
The due date is an estimate. Only about 5% of babies are born on their exact due date. Delivery within 2 weeks (38-42 weeks) is considered normal.
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How Due Date Is Calculated

Naegele's rule adds 280 days (40 weeks) to the first day of your last menstrual period. The calculation adjusts automatically for cycle lengths different from 28 days.

Pregnancy is divided into three trimesters: first (1-12 weeks), second (13-27 weeks), and third (28-40 weeks). This calculator shows the timeline for each trimester.