Estimate your pregnancy due date based on the first day of your last menstrual period using Naegele's rule.
Estimate your pregnancy due date based on the first day of your last menstrual period using Naegele's rule.
Due Date = LMP + 280 days (Naegele's Rule)
LMP January 1, 2026 → Due Date October 8, 2026.
Enter your values in the fields above and click "Calculate" to get instant results. All calculations happen in your browser — nothing is sent to any server.
What is Pregnancy Due Date Calculator?
Estimate your pregnancy due date based on the first day of your last menstrual period using Naegele's rule.
What formula does this use?
This calculator uses: Due Date = LMP + 280 days (Naegele's Rule)
Is this calculator free?
Yes! All calculators on CalcNest AI are 100% free with no account required.
Is my data safe?
Absolutely. All calculations run locally in your browser. We never store or transmit your input data.