Wzór
Add 280 days to the first day of the last menstrual period, adjusted by the difference between the cycle length and 28 days.
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Estimated due date
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Add 280 days to the first day of the last menstrual period, adjusted by the difference between the cycle length and 28 days.
Use values that match your situation and location. Verify rule-based, contractual, financial or health decisions against an authoritative local source.
Results are for first-pass estimates and scenario comparison. Important tax, employment, health and investment decisions should be verified against local official guidance or a qualified professional.