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Pregnancy Due Date Calculator

Estimate your due date using Naegele's rule (LMP + 280 days) and track gestational age.

Estimated due date
Monday, January 25, 2027
280 days to go
Gestational age
0w 0d
Trimester
1
Est. conception
Monday, May 4, 2026

Informational estimate only. Not medical advice. Consult your physician, midwife, or OB-GYN for pregnancy care decisions.

Frequently Asked Questions

What is Naegele's rule?

A clinical estimate: due date = first day of last menstrual period (LMP) + 280 days (40 weeks). Assumes a regular 28-day cycle with ovulation on day 14.

How accurate is this?

Only about 4-5% of babies are born on their estimated due date. Most deliveries fall within ±2 weeks. Ultrasound dating in the first trimester is more accurate.

Is this medical advice?

No. This tool is for informational purposes only. Always consult your physician, midwife, or OB-GYN for pregnancy care decisions.

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