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Current gestation
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Trimester
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Est. conception
Estimated using Naegele’s rule (LMP + 280 days, adjusted for cycle length). Only a scan can confirm your due date.
Frequently Asked Questions
How is a due date calculated?
By Naegele’s rule: add 280 days (40 weeks) to the first day of your last menstrual period, adjusted if your cycle is longer or shorter than 28 days. Only about 4% of babies arrive on the exact due date.
Estimate your due date from your last menstrual period, with your current gestational age and trimester.