Pregnancy Due Date Calculator
Estimate your due date based on last menstrual period or conception date.
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Understanding Pregnancy Dating
Pregnancy is measured from the first day of your last menstrual period, not from conception. This is because the exact conception date is often unknown, while the LMP is easier to track.
Pregnancy Timeline
- Week 4-5: Positive pregnancy test
- Week 8-12: First ultrasound, heartbeat visible
- Week 18-22: Anatomy scan, gender reveal possible
- Week 24: Viability milestone
- Week 37-42: Full term, baby can arrive any time
Frequently Asked Questions
The standard method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period. If you know your conception date, add 266 days (38 weeks).
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