Pregnancy Due Date Calculator

Calculate EDD using Naegele's rule with trimester breakdown

📅 Calculate Your Due Date

First Day of Last Menstrual Period (LMP)

Naegele's Rule: LMP + 1 year - 3 months + 7 days

📖 Method Reference

Method	Calculation	Accuracy
LMP (Naegele's)	LMP + 1y - 3mo + 7d	+/- 2 weeks
Conception	Conception + 266 days	+/- 3 days
Ultrasound	US date + (40w - EGA)	+/- 5-7 days (1st tri)
IVF Transfer	Transfer + (280d - embryo age)	Most accurate

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Disclaimer: This calculator provides an estimated due date for educational purposes. Only 4-5% of babies are born on their exact due date. Always follow your healthcare provider's guidance. This tool does not replace medical advice.