Our due date calculator uses the standard Naegele's rule — a 280-day pregnancy estimation method widely used by obstetricians. Based on the first day of your last menstrual period (LMP), it calculates your estimated due date, current pregnancy week, trimester, conception date, and how many weeks remain.
While this calculator provides a reliable estimate, only about 5% of babies arrive exactly on their due date. Most are born between 38 and 42 weeks. Always confirm your due date with your healthcare provider through ultrasound and clinical evaluation.
All calculations are performed locally in your browser. No data is stored or transmitted.
Enter the first day of your last menstrual period