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Pregnancy Due Date Calculator
HealthCalculate due date and gestational age from last menstrual period using Naegele's rule.
ttb run pregnancy-due-date
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How to Use Pregnancy Due Date
Enter your Last Menstrual Period (LMP) date using Naegele's rule (280 days = 40 weeks). The calculator shows your due date, current gestational age, weeks remaining, and estimated conception date.
1
Enter LMP date
Click the date picker and select the first day of your last period.
2
View due date
The calculator instantly shows your expected due date.
3
Check gestational age
See how many weeks and days you are along today.
4
Plan ahead
See weeks remaining until due date and estimated conception date.
Frequently Asked Questions
Is this 100% accurate?+
No — only about 5% of babies arrive on the exact due date. Naegele's rule assumes a 28-day cycle.
What if my cycle is irregular?+
Ask your doctor to adjust LMP based on ultrasound dating, which is more accurate.
Can it predict the baby's gender?+
No — gender can only be seen via ultrasound around 16-20 weeks.
What is the due date range?+
40 weeks ± 2 weeks is considered "term." Most babies arrive within this window.
Should I share this date with others?+
Many expect mothers keep it private initially or share a month, not an exact date.
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