Pregnancy Due Date Calculator
Free pregnancy calculator to find your due date, current week, trimester, and baby milestones based on LMP, conception, or ultrasound.
The first day of your last period
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Calculate Your Baby's Due Date with Confidence
Expecting a baby? Our pregnancy calculator helps you determine your estimated due date, track your current pregnancy week, understand which trimester you're in, and see important milestones throughout your pregnancy journey. Get accurate calculations using your last menstrual period, conception date, or ultrasound results.
How Pregnancy Dating Works
Pregnancy is typically 40 weeks (280 days) from the first day of your last menstrual period (LMP). This is Naegele's Rule, the standard method doctors use. Your conception date is usually about 14 days after your LMP (during ovulation). Pregnancy is divided into three trimesters, each about 13 weeks long, with distinct developmental milestones for your baby.
Due Date Calculation (Naegele's Rule)
Due Date = LMP + 280 daysWhy Use Our Pregnancy Calculator?
Multiple Calculation Methods
Calculate from LMP, conception date, or ultrasound results for maximum flexibility.
Track Your Progress
See exactly which week and trimester you're in, plus days remaining until your due date.
Important Milestones
View key dates like trimester transitions, recommended ultrasounds, and viability milestones.
How to Calculate Your Due Date
When to Use This Calculator
Early Pregnancy
Just found out you're pregnant? Calculate your due date and see which week you're in.
Planning Ahead
Know when to expect important appointments, tests, and prepare for your baby's arrival.
Verify Ultrasound
Compare your calculated due date with ultrasound dating to ensure consistency.
Share Milestones
Keep family and friends updated on your pregnancy progress and important dates.
Frequently Asked Questions
The calculator provides an estimated due date. Only about 5% of babies are born on their exact due date, but 90% are born within two weeks before or after. Your healthcare provider may adjust your due date based on ultrasound measurements, which are most accurate in the first trimester.