Due Date Calculator
A due date calculator uses your last menstrual period (LMP) to predict when your baby will be born. The standard method (Naegele's Rule) adds 280 days (40 weeks) to the LMP. Due dates are estimates — only 4% of babies arrive on the exact predicted date.
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Tip: Track your LMP accurately — the due date affects screening test timing, growth scan interpretation, and delivery decisions.
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Fun Fact
The record for the longest confirmed human pregnancy is 375 days (12.5 months), reported in a 1945 Los Angeles case.
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