Due Date Calculator
Estimate your baby's due date.
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Conception (est.)
Current Week
Trimester
Days Remaining
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Frequently Asked Questions
How is the due date calculated?
From last menstrual period (LMP): add 280 days (40 weeks). From conception: add 266 days (38 weeks).
How accurate is the due date?
Only about 5% of babies are born on their due date. Most arrive within 2 weeks before or after.
What are the trimesters?
First: weeks 1-12. Second: weeks 13-26. Third: weeks 27-40.
When should I see a doctor?
Schedule your first prenatal visit at 6-8 weeks. Contact your healthcare provider as soon as you know you're pregnant.
Can the due date change?
Yes, ultrasound measurements in the first trimester can adjust the due date, and are considered more accurate than LMP-based calculations.