Pregnancy Due Date Calculator
Estimate your baby's due date using your last period, conception, ultrasound, or IVF transfer date. Learn about gestational age, trimester progress, and week-by-week development.
Results
Estimated Due Date
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Current Gestational Age
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Current Trimester
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Key Pregnancy Milestones
- ❤️ Heartbeat Detectable: —
- 👣 Movement Usually Felt: —
- 🎯 Full Term Begins: —
Understanding Your Pregnancy Due Date
Wondering when your baby will arrive? Our Pregnancy Due Date Calculator helps you estimate your baby's expected arrival using multiple methods — including your last menstrual period (LMP), conception date, ultrasound measurements, or IVF transfer date.
How to Use This Calculator
- Select a method: Choose how you'd like to calculate your due date — LMP, conception, ultrasound, or IVF.
- Enter the required date(s): Based on your selection, the input may change dynamically.
- Optional: If using LMP, enter your average cycle length (default is 28 days).
- View detailed results: See your due date, current gestational age, trimester, and key pregnancy milestones.
Trimester Breakdown
First Trimester
Weeks 1–12
- Fertilization and implantation
- Heartbeat can be detected by week 6
- Nausea, fatigue, and hormonal changes
Second Trimester
Weeks 13–27
- Baby's movements felt (~18–20 weeks)
- Facial features and organs develop
- Gender reveal often possible by ultrasound
Third Trimester
Weeks 28–40
- Rapid weight gain and brain development
- Baby “drops” into the pelvis (~36 weeks)
- Full term begins at week 37
Frequently Asked Questions
How accurate is a pregnancy due date calculator?
Due dates are estimates based on averages. Full-term pregnancies typically range between 38 to 42 weeks.
What is the most accurate method to calculate a due date?
An early ultrasound (around 8–12 weeks) combined with your LMP offers the most accurate prediction.
How do I calculate pregnancy weeks manually?
Count from the first day of your last period. For example, if your LMP was February 18, 2025, then April 1 marks 6 weeks of pregnancy.
Can due dates change?
Yes. A healthcare provider may adjust it based on fetal growth seen in ultrasounds.