Pregnancy Due Date Calculator
Expecting a baby? Our due date calculator estimates when your little one might arrive, along with your current pregnancy week and trimester.
What Is
A pregnancy due date calculator estimates the delivery date based on your last menstrual period (LMP) or conception date. Pregnancy typically lasts about 40 weeks from LMP.
How to Use
- Choose your calculation method: LMP or conception date
- Enter the date
- Select your cycle length (default 28 days)
- Click Calculate to see your estimated due date
- View your current week and trimester
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Frequently Asked Questions
How accurate is the due date?
Only about 5% of babies arrive exactly on their due date. It's an estimate — most arrive within two weeks before or after.
How is due date calculated?
The most common method is Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period.
What are the three trimesters?
First trimester: week 1-12. Second: week 13-27. Third: week 28-40.
Can I use this if I don't know my LMP?
Yes, you can use your conception date instead if you know it.
When should I see a doctor?
As soon as you suspect pregnancy. Early prenatal care is important for a healthy pregnancy.